My bipolar GF lied to me in a manic state

Tonight my girlfriend lied to me and said she went to sleep at 10 pm, but we had been talking all day about the manic episode she is going through right now. She’s hypersexual, and I know she was with someone else last night.

I love her, and I know this is not really her. I think I will be able to forgive the things she might do during these manic episodes. When she’s stable, she is the best girlfriend: caring, loving, and very understanding.

But I’m afraid these manic episodes will break me. I talked to her about doing the sexual things she wants, and I will go along with them. I don’t care, I just want her to be happy in every situation.

Now I’m writing this at 2 am because I can’t sleep after the lie she told me. Tomorrow I will ask her what truly happened, but every time I do, she gets mad and says that I don’t believe her.

I don’t know what to do. I still want to be with her, and I feel so good with her when she’s stable. Please send some love and advice.

Thank you