So my girlfriend and I mutually agreed that we would break up after high school since I was moving out of state and she stayed to go to community college. A few days later she told me that she is dating my best friend!! I get that we are not dating anymore and she can do whatever she wants but inside it feels like i have been betrayed by both of them. I don't know if they planned it while we were together or what but the point is I'm not sure if I should feel bad about it or let it go. I'm pretty pissed off at the whole situation and I don't want to talk to my ex anymore even though I still like and forgive my friend. The worst part is my friend moved out of state as well , only a few days after me. Basically I just want other people's input on whether I should understand where my ex is coming from or if they are in the wrong for dating