I agree with Copperstar, re: responsibility. Definitely get tested for STDs, and face up to what you have done--what you have chosen to do. I don't think BP caused you to take that first drink ... You did. Are you alcoholic? I am, and I think the alcoholism and bipolar are a devastating combination. Once I choose that first drink, I seldom stop. It usually drives my hypomanic into mania, when all the worst of BP kicks in.

If your girlfriend knows you well and has learned about you illnesses, I suspect she'll be more horrified and concerned about the seventy beers (!!!) than the other woman. Unless you see that (or any) other woman again.

I think you're a fairly typical bipolar alcohoholi. In my experience, a pdoc who will take the time to find the best meds for you and an AA sponsor who has (or is willing to gain) some understanding of BP can help you turn your life around. But YOU have a h€ll of a lot of work to do every day. It's a lifetime commitment, but well worth the effort.

Best wishes.
roads