AITAH for being pissed about my GF making out with her friend for a dare?

So here’s the basic rundown, GF and I have been together several years. She’s Bi, which I don’t have any issues and never had any concerns with.

She and some girlfriends went out to an adult game night (which she states none of them actually researched beforehand) the other night.

This was while I was working, one of many overtime shifts I have this week. So she goes to this event at a bar and gets home late, says briefly we need to talk about something that happened.

Next day, after I worked another overtime shift, she tells me that the event was basically drunken dares in front of the crowd. Her friend gets her name pulled and gets “flash the crowd or make out with a stranger).

So GF states to save her friend embarrassment she got up and made out with her on stage for 10 seconds, there is apparently video.

She claims it was nothing sexual and she isn’t attracted to her friend.

Says she wanted to tell me so there was no misunderstanding. I was pretty pissed off and still am a few days later.

AITAH? Also further issues is she used my account to pay for everyone’s drinks to the tune of $120 dollars.