Why was my brother more upset with his best friend (now ex best friend) than cheating ex girlfriend?

Anonymous

He got cheated on a couple years ago. I've wondered this:

He went after his best friend and fought him. He took all his anger on him. He only dumped the ex girlfriend but didn't even talk bad about her to others. He just blocked her and that was it, nothing in comparing to what he did to the best friend.

I've noticed this behavior in certain men. They go after the man she cheats with mainly. Why? He isn't the one promising to be faithful to him.

Why was my brother more upset with his best friend (now ex best friend) than cheating ex girlfriend?
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