Am I wrong to be questioning my whole relationship off one event?
I (M 34) have been with my girlfriend (F 35) for about 1.5 years. Overall very happy and loving relationship. I'll say up front I have some internal struggles with anxiety and trust at times due to getting cheated on and pretty fucked over by my last ex. So I value trust and mutual respect in a relationship very highly.
Earlier in the year we had a discussion on boundaries as she was going on a bachelorette trip to Vegas. One of these included that I wouldn't be okay with her dancing with guys in a nightclub, and she was fine with that. And to be clear, anything I would ask of her I would also hold myself to the same standard, so I wouldn't dance with any women in a club either.
Recently we were attending a friend's wedding. Getting towards the end of the night we'd both had a few drinks and were out on the dance floor having a good time. We were dancing together and then at one point, she accidentally backed into a guy that she's known for a few years (he's married, not a close friend of hers, but not a stranger either). She took a quick glance to see who it was, and then kind of kept dancing and backing into him further. Then she proceeded to bend over pretty far and basically twerk / grind on him for maybe 10 sec (hard to say). Then just came back and started dancing with me again like nothing had happened.
I was pretty shocked and got pissed off right away so I left the dance floor. We've had several discussions about it since then and she knows how upset I am. She has said she didn't mean anything by it, it wasn't intentional, she feels like she doesn't even really know why she did it, and she doesn't even really remember exactly what she did, but at the time she thought what she was doing was harmless. She has since taken accountability for it and not really tried to otherwise defend it. But I can't help but lose all trust in her. Maybe that's extreme on my part. To me it comes across as she can't control her behaviors if she can do something like that, especially 5 ft in front of me, for apparently no reason at all. While thinking it's harmless. And if she'll do that in front of me, what will she do if I'm not around?
Part of me thinks this is a big deal, part of me thinks I'm overreacting, and I would like a sanity check from you all.