Do I have a right to be mad?

One of my best friends made out with my ex boyfriend a month after we broke up. at the time we weren't super close friends and I know that it shouldn't bother me because I didn't find out about it till months later but I still get upset by it just because I feel like a trust was violated.

shes my one of my best girlfriends but I can't help but feel upset

btw. I found out not by her telling me but when I said I was a great kisser and she said oh I know. and when I asked how I she would know, that's when she told me reluctantly knowing I would be upset.

should I not care since its in the past or do I still have a right to hold a little bit of a grudge. she new how much he meant to me.

Do I have a right to be mad?
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