I agree with Thinker. It sounds to me more like borderline personality disorder than bipolar.

I also see some co-dependence here.

I really think it is time to move on. I know it's hard but all you are getting in this situation is heart ache.

You sound like a really nice guy who deserves a really nice gal. Not to say that mentally ill people can't be nice. They CAN. Just maybe not this particular mentally ill gal. And who knows maybe someday she will get proper help and become worthy of a guy like you. But it is NOT your responsiblity to get her to that point--no matter how much you love her.

I speak from experience. I was in a very abusive relationship for 7 years with a borderline personality gal. It was brutal and damaging to me in ways that have taken me years trying to get over. I have just recently been able to forgive her and in doing so stop letting her hurt me and am now starting to move on to better things. All with the help of the people here on psyche central and my therapist.

You deserve better. Much, much better. I hope you realize this soon and move on to a better, happier and more fufilled life.