I know all this stuff is going to sound tedious and immature but im very new to relationships. Im not good at processing this stuff yet.

Been seeing girl for a few months now, were very compatible and I know for sure she cares about me. We have not yet had "the talk" but have been acting like bf and gf. I also have a best friend since we were 14. Ill just refer to her as F and him as M

Were at a bar last night. M is drunk and guess thought it would be funny to put his fingers in Fs mouth. He also did it to his girl. I know it sounds dumb but we were all really drunk. She bit his fingers but was laughing about it like it was funny. M was also doing stuff like pretending to grind on dudes, hes not gay, that was 100% comedic, so im not sure how to take the finger in the mouth thing. Sexually or just drunk comedic shit.

She was being touchy with him after she got drunk. She does this with everyone though. She eve asked a stranger guy to dance right infront of me. She then quickly asked me to come too. Again I dont know if it was meant to be a sexual thing because it was right infront of me, maybe shes just kind of socially oblivious.

While F was being touchy with M she did some weird thing where she made her mouth super wide open and brought it close to his face. But didnt touch.

When I came back from the bathroom I saw them sitting together and their faces were really close to each other making exaggerated "lovey" faces. It was so exaggerated im thinking it had to be a joke, nobody naturally makes those faces.

Im going to her place now to end it and i think im going to have to end my 15 year old friendship too. I dont know what else to do. Please tell me im being stupid and this isnt a big deal.