Exes dating friends

So my ex messaged me yesterday saying she wanted to get coffee. At first I was excited because woo, more people wanted to hang out. But then I got a little nervous I've been remembering more of the stuff rather than good about our relationship. And then I got even more nervous when she was being especially punctual about this meeting.

Long story short, she told me that she's now officially dating one of my friends. :/ At first I was surprised and happy for them. Then she said that's surprised I'm not flipping out. I thought about it. It's a bit back-stabby, but it wasn't outside of the realm of possibilities. But then she said something that made me lose my appetite: they just spent the week together.

Somehow, knowing that while I was on vacation having a blast, I felt good about it knowing that at least I was having a better time that others. Now that I know that she's having a magic getaway with one of my friends. That shatters my believes.

She could tell I wasn't happy anymore. I tried to rationalize it and realized that this isn't the first time this has happened. Cough, Chris and Krystle. And cough(?) Igor and Monica. Somehow some people grow up without realizing that their friends might have feelings for their exes. Those who do then, in order to preserve friendships, stay the fuck away from their friends' exes. Or make abundantly sure that they wouldn't be hurting anyone's feelings. Chris talked to me before dating Krystle. This friend didn't.

I don't know what the difference is between the people. Maybe some just don't have feelings for their exes, or just aren't super capable of empathy. Whatever the reason, I was hurt for aforementioned two reasons. That, plus I wanted to move on first. So much for that.

Either way, that evening coupled with us terribly losing the pool match in the tournament last night made my day kind of shitty. I was looking forward to at least watching Game of Thrones, but I was too late for that, too. I spent the rest of the night drinking and talking to strangers on Omegle. And I talked to the OC girl on the phone a little.

When I woke I was dreaming about my ex telling me that she's dated other ones of my friends and I shouldn't judge. 0.o I was angry while still waking up. I'm feeling a little bit better now. This deep-rationalization I'm doing is helping me understand myself as a person and be sad in a constructive way. But honestly I wish I knew how to do self-behavioral-therapy so I can just move on without going through the struggle. If this last sentence didn't make much sense to you, look up "Behavioral Therapy Revolution".