What would I do?  I'll tell you.  If I found out that he cheated on me and possibly may get another girl pregnant, I'll drop him just like that.  I wouldn't even think about being friends with him bc he disrespected me and our relationship.  He was selfish and had no consideration of my feelings when he knew damn well what he was doing.  He can't use the "I'm sorry, bc I'm taking my meds wrong," excuse all the time.  It gets old and it gets old fast.

Honestly, I think you need to take a step back and realize what you are getting yourself into.  You need to give him time and to prove to yourself and him that he can take his medication correctly and that he can be trusted again.  Don't rush into a relationship with him bc you still love him so much or you think you two have grown and matured since.  I mean, really, how long has it been?  Don't make a decision based on your emotions.  You need to really think about it and his health should be his number one priority.  He needs to keep himself accounted for his actions and not blame it on his meds.  If you really see you two together in the near future, continue casually dating but don't commit yourself to him until you know for sure he is a responsible adult who can take care of himself and be trusted again.  Obviously, since you are afraid of history repeating itself again, you still have doubts.  Take it slow or if not, find someone else who will suit you better.

Every relationship has its ups and downs, but it shouldn't fluctuate so much like a Richter scale on coffee.  If I were you, I wouldn't even consider getting back with him because I wouldn't be able to trust him anymore.  Not for being faithful, and not for proactively taking medication to keep himself in check.

While my ex didn't cheat on me, he has done a lot of things that nobody in their right minds would've done to anyone else, much less someone they say they love.  He may not have had bipolar, but his moods and tendency towards domestic violence could've fooled us all.  Leaving him was the best decision I ever made!

I know what it's like to be with someone that is bipolar. My boyfriend is, too.
Luckily for me, I met him in a time of his life where he is (finally... sigh) mature enough to take his meds regularly, or at least regularly enough. But during the first months, I had to witness him completely fall out of touch with the world. It got so bad that he had to be hospitalized for more than 2 months. Trust me, I know it's hard.

The thing is, having this disease makes it easy for a man to use it as an excuse. If you feel like he truely regrets his mistakes, sees the faults in his actions and takes responsibility, then I think you two could have a chance. But don't let him use it as an excuse. He's got the medication, so if he's really willing to change, he'll make sure to take it.
Sure, the meds suck, he might feel like they take away some of the quality of his life and they take so many months to get used to and get the dosage right. But it's worth it. His disease might get worse and he might end up missing out on months or even years of his life. If he's serious about wanting to change and you feel like he knows all the consequences and is willing to deal with them, then you can give him a second chance wholeheartedly.

Good luck. :)

the whole thing is a deal breaker.  it's more than a roller coaster relationship.  i've been in roller coaster relationships but nothing with cheating.  i always believe in second chances but cheating is one that i won't forgive.

Hells to the nos deary. He sounds like a complete douche and I'd rather get knocked up than be with him. :/

obvious answer... 

I've been in a similar situation (no cheating). Mental illness is not an excuse to mistreat someone. "Mistaking your meds" is a conscious decision. I would leave. It's always going to be an issue.
People diagnosed with bipolar disorder are often said to have issues controlling their sexual desires. That said, I was with a bipolar schizophrenic for 5 years and he NEVER cheated on me. He also didn't treat me like crap for the first 3 1/2 years.
When he first started treating me like crap, I stayed. He was newly diagnosed and was making every effort to get better. He went to every doctor appointment, followed what he was supposed to do to a T, went back if he was having side effects, quit drinking, etc. After a few months, things got better for a long time. When he started drinking to cope and not taking his meds correctly for various reasons and using his illness as an excuse, I knew it was time to leave. As much as I loved him, and as much as it hurt to watch him go through all of that emotional pain, it wasn't worth putting myself in emotionally (and sometimes physically) dangerous situations.

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I'll be the minority in the comments. I think what he did was crazy- it must've had an impact on you. I can relate to you 'cause my ex cheated on me too but wasn't as bad as yours though it was still really bad. People are going to tell you no, but your heart wants to find a justification to say yes, you know what people are going to say to you but you want to try anyway. The rational answer would be no, but if you really love this guy and he's changing for the better, go for it. If he does similar crap again, walk away from him and never look back. My friend's cheating ex came back and she gave him a second chance, he was great for a few weeks but did the same crap to her and they seemed to have ended it for good this time. She still loves him but what can she do really? My ex never came back, I think the way you do too, despite the things he did to me, I still wished for him to return 'cause that's how great my love for him was. Anyways, turn him down only if you can do it fully. I believe some people can change, some never do but you don't know that yet.