We live and work in a college town, so almost every day of the week there are several bars that offer drink specials and live music and whatnot. Well, last night there were two bands playing in our town. One was a band she really liked, and another was a band I really liked. So we made the compromise of going to her band's show, then going to mine a little later on. I know she didn't really like the band I liked, but she was going to go for me which I thought to be really cool of her.
So we and a couple friends head to the first show, drink and have a good time, and then we decide to head to another bar nearby. I wasn't drunk but my girlfriend was a little buzzed at the time. I'm at the bar waiting for a couple of drinks and I see some guy, easily in his 30s, come up to my girlfriend and pick her up in a hug and give her a quick kiss and set her down and start talking to her. The drinks are taking FOREVER to come so I just sit there watching my girlfriend and this guy talk while I wait. My blood is boiling at this point. Like who the fuck was this guy and why did he kiss her?
I finally get the drinks, head back to my girlfriend, and introduce myself as her boyfriend. He leaves shortly after, I guess pretending to see someone else he knew. I asked my girlfriend who he was and she goes "Just a friend from school." So I asked why he kissed her. She immediately recoiled and seemed flustered. She goes "I don't know" but I keep asking her about him. Eventually she mentions that it was someone she hooked up with before. My stomach turned. Then she gets mad that I'm upset about it.
I said "You should have told him it was not okay to do that to you. I mean it's really inappropriate for him to kiss you." and she goes "it was just a kiss. So what?" and I just stared at her. We continue talking but the band I like is about to play so I want to head to the bar they're playing at. She complains about how she doesn't want to go. I told her that we came here together and I went to see the band she wanted to see. She then says that her band is still playing and that her "friend" from before is going back to that bar so she was considering going back with him.
I told her "Alright go for it. But don't expect us to be a couple anymore if you do." She got mad and said I was overreacting. So I just left. I called an Uber and decided to just go home. Once I got home I turned my phone off and went to bed.
This morning I woke up to texts from her calling me immature for walking away like that and then another from her apologizing for what she did and said.... And then another one that was her being pissed off for me not responding to her.
I'm seriously considering breaking up with her over all of this. It just seems like a huge red flag to me. I don't care that she hooked up with another guy in the past. I'm upset she was omitting it and then didn't care that he kissed her. I just don't think that was respectful of her at all.
tl;dr: Girlfriend gets kissed by a guy and omits the truth when I asked her about it. Considering breaking up with her because I feel like she doesn't respect my view on it."