I feel like I just read my life story involving MY mother-in-law!

It could be jealousy, like you said, she could feel like you're going to take him away from her. And by the way, she hated his ex, too. Try to reassure her that her son will always be near.

Your husband has to step up, and cling to his wife (you) as his new family.  That doesn't mean he loves his mom any less, just that his pirority is his new family (i.e., himself and you).

I can see that my wife'll probably think that most girls will not be good enough for our son.  But that doesn't mean she'll act without class, or antagonize our future daughter-in-law.  As for our daughter, well, she's aggressive, cantankerous, and rambunctious.  I feel sorry for the guys she'll run over. 

My dad's mom hated my mom when they were married... and she was a huge cunt until my dad told her that she needed to stop.
After that she cried to the whole family about how horrible my mom and dad treated her and "fell into a depression" and couldn't get out of bed for 6 months... eventually... she realized that my parents weren't going to kiss her ass or play into her drama and she gave up.
She's still a bitch... but no more of one than she is to everyone else.

I'm trying to stay away from my guy's house as much as possible now a days.

I am so sorry, my MIL is a dream.  But, the best advice I've heard is don't give up...

Don't stop going over there, because then she will hold it against you.  When you are there, bring something constructive to do, or help out if you can...  when all else fails, I try drying and putting away dishes.
Don't MAKE your husband stand up for you, but ask him to please speak in your honor and be mindful of his commitments to you.
Don't ever make him choose, because in the end, you may really lose.

I feel like I could have written this...

It seems like a lot of women have trouble accepting that they will no longer be the number one woman in their son's life. I think a lot of these women would rather see their sons in troubled, argumentative relationships like the one your husband had with his ex than to see them in a healthy relationship. As long as the son is in an unhealthy relationship, he will still need mommy dearest to help him deal with his troubled relationship. She will still be the needed caregiver, which is what she wants. It's sick, but that's what happens when you get insecure women who have nothing in their life besides their children.

this is a very good website 

you can go and see it

http://www.shoes4world.com

I haven't met my boyfriend's mother. He says she likes me because she hasn't met me.The minute she meets a girlfriend, she goes crazy. So he says I'll never meet her, haha.

I train my man to pick me over his mother, why? Because I come from a family that is horrible to daughter-in-laws and at the end of the day, mommy isn't married to her son, you are. Never, ever let anyone come into your life and mess you up like that. If you want to have a child with your husband, I'm sure you would never want your kids to witness her ridiculous behaviour towards you. So nip it in the bud, NOW.

I have a MIL who can be difficult, too. Like, controlling, emotionally abusive, etc. I am going to tell you what we have had to learn to survive and thrive despite it, and what I am going to say comes also from the experience of other women with extremely difficult mothers-in-laws who helped me get through it until she came around. "Mother-in-law from Hell" is one term for it. For this marriage to work, as far as I understand it, your husband needs to be make a conscious choice to stick by YOU and not his mother. I'm not saying to issue an ultimatum... but do be aware that if he stays under her wing/foot/thumb the relationship is in danger. He needs to defend it. Yes, you should respectfully defend your rights too as a human being. You have already done more than one would reasonably expect to make peace, but I know it is smart to keep trying. But don't be a doormat. It can be a hard balance.
Most importantly, HE needs to stick up for YOU. And you need to stick by him, too, in case she tries to buddy up with you and make him look bad and drive a wedge. You have to be a team, and present a united front. Even if you think he is wrong about something, or he thinks you are wrong about something, save that for later- when she is with you, don't ever, ever let his mother "split" you on two sides of a disagreement.
Unfortunately, while there is a lot you can do, much about the health of your future marriage depends on how your husband handles his relationship with his mother. You can only do so much. It is her attachment to him that is unhealthy, and he may need to put some distance there. If he is defending his mother's irrational, hurtful and controlling behavior (and you haven't said he is, but just in case) that would really be a problem!
In my case, my husband had to make a choice to set boundaries with his mother. He had to tell her there were things he did not want to talk about with her. (All of her children had to do this because she would not stop going on about certain subjects.) He had to set emotional boundaries and conversational boundaries and also just not talk to her as often. She was creeping around and reading his phone history (he had been on her plan for a little while after we got married) and complained he was talking on the phone to his dad. (My in-laws are divorced.) So, my husband was like fine, thanks for offering to pay my phone bill, but I have to take this and be independent now that I am an adult, and get my own plan. She was of course upset and threw a fit when he did that and basically just freaked out. She thew a fit every time he set any boundary like that with her, but he sticks by it and eventually she accepts it and conveniently 'forgets' she ever was upset about it. There were lots of things like that that she was offering to pay for because she had money (like car insurance), but it gave her leverage and control and as poor as we were he had to back away from that. She still gives random gifts a lot, but she has been doing much better about using it as leverage. As long as we thank her properly (card must be handwritten, and it must be physically mailed- handed to her does not count) she stays happy and seems to feel appreciated. My husband has always been really good about defending me to her before she even gets too critical and that is wonderful. Really the problem is her being too hard on him. Setting the boundaries has helped. She really has come around, though. I mean, hearing her wax eloquent on conspiracy theories for hours whenever we hang out can get old, but I can deal with that! She was never so against me as it sounds like your MIL has been against you. I am terribly sorry about that. That would be very hard.

It is kind of difficult, but once a man is grown and has a wife of his own, the emotional umbilical cord to his mother has to be cut, even if it has to be gradual. While they can still have a relationship, the more controlling and dominating of him she is, the more distance he will have to set for the safety of your own relationship. I'm sure that if you guys are both intentional about having a healthy relationship and work hard at it this will happen. It's okay to get professional help if you need it, too. After we'd been married for a year my husband and I went back for two sessions to the guy who did our premarital counseling. We thought it would take forever to fix the in-law problems, but just two sessions did it and then we were good to go. Even healthy, smart relationships can benefit from a little outside perspective sometimes, and I highly recommend it.

Good luck! I hope your crazy mother-in-law comes around.