I agree with Sandman, it's easy to attribute this kind of behavior soley to the illness once you know about it. But people still have their own personalities, and other problems along with it. Even if he didn't have bipolar he could still bahave the same way.

I also have bipolar, I don't cheat, gamble, use drugs, drink, or hurt people I love like this. So while the bipoar might complicate things it is not the only factor. I also refuse to take meds. The medications do not automatically change anything. And for tons of people the meds seem to do not much good at all, or cause other problems. From what I have seen most people with bipolar who find stability have had to work very hard for it, and it seems usually it is that hard work they put into their own wellness is what brings the most change. Meds can help people get there, but it will probably take more than a perscription.

If he is serious he has to really want it for himself and will do it with or without you. Bipolar just is not an excuse to treat people like this. Sabatoging your relationships with your friends, telling you he cannot be with you and at the same time keeping you in his pocket.

I would walk away, and find someone that treats you like you deserve to be treated. Like Sandman said if he is going to get help and change he will, if not he won't and you will at least be free from the drama and heartache. He does need to be accountable for himself.