Most Helpful Guy
I don't think he has a right to be upset with you about it since you were broken up and he's the one that broke up with you and made it clear that it was permanent (though of course it later turned out not to be).
At that point, I think you were free to do whatever you chose to do. Personally, I think it would have been better not to have sex with a guy that you really hadn't developed a relationship with especially if it was mainly because you wanted to forget your ex and not because you cared about the new guy, but I still don't think your boyfriend has any right to be mad at you for doing that while you were broken up.
Maybe he won't like it, but I think he has to accept it. If he doesn't and he gets mad at you about it, then I think you should seriously think about whether you want to be with a guy that will break up with you, make it clear he doesn't want to be with you, then just a few weeks later change his mind and then get upset with you for doing something with another guy during that time. To me, that means he's not really mature enough for a serious relationship.
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Most Helpful Girl
Tell him he had his chance with you the first time. If he can dump you once, he can do it again. Like you were, when you slept with this other guy, he is probably just feeling lonely himself, and thinks you will fall over backwards to have him back. Surprise him, and tell him to naff off!
Let the worries about this other guy fade into the past. You did nothing wrong, and do not have to answer to your ex!