Going out with the girl who hit on my man?

Okay, so a while back my boyfriend, brother, and a few of his friends all went out to a bar. Long story short, my boyfriend went out for some air and this girl my brother brought along followed him and they sat outside talking about her guy problems and stuff. Anyway, it caused a lot of drama and my boyfriend and brother almost had a fight because my brother thought he cheated on me with that girl. Both of their stories lined up though and I know he would never.

Anyway, my brother has invited her, me, and my boyfriend out to a bar and Im not sure how to feel?

This girl apparently told my boyfriend she loved him, hugged him, and wouldnt leave him alone all night that night.

I also think we're going out for her birthday aaand yeah...

My boyfriend said she was just drunk and probably didnt mean any of it and that we should go anyway.

I dont know what to feel or if I should go out. Help!