First time ever posting to Reddit so sorry if I mess up on something. Friend told me I should post here.

Okay so I recently got out of a pretty bad relationship. It didn't last too long, only a couple of months. Before me and this girl got together we were pretty close friends. We always argued, but we had a lot of fun. She and I both had a breakdown one night and agreed that it's best if we broke up. We then both made a promise to the other that we wouldn't get into another relationship, (as we both still really liked each other,) for a long while. We agreed that two months should be long enough.

Everything went fine for about a week. We were still friends, and we still talked pretty consistently. It was almost like nothing ever happened. Then one day, when I'm hanging out with my peers, less than two weeks after our breakup, one asks me if I'm doing okay. I say yeah, and ask why. They reply, "Because you and (ex) broke up." Obviously I say I'm alright, and say that we're both still friends, so I'm alright. Then another person says, "Wait, I thought (best friend) and (ex) were a couple?" Things got really quiet really fast. I ask what they mean, and they say that they saw them hugging and holding hands and being 'more-than-friendly' with each other. Obviously I get upset.

I confront her about it, and she doesn't see the problem. She says that the promise made at that time was 'then' and this is 'now'. Essentially she's trying to excuse breaking our promise. We have an argument over that, she ends up crying, and getting her new boyfriend, (my best friend,) to scream at me for being, in his words, an "insensitive bitch." I don't know if I'm the asshole or not. Obviously I don't own her, but a promise is a promise.

&amp;#x200B;

TL:DR; My ex girlfriend and I made a promise to not get with anybody for two months. Two weeks later I find out that she got with my best friend. Her and her new boy toy both think I'm insensitive for being pissed off at her for breaking our promise.