Wowww

My ex and I dated for 2 years and the minute we broke up he got into another relationship with his old bestfriends gf. Turns out he’s cheating on her. Can anyone explain to me men please!!!???!!! Just a little bit of facts. Here are some facts about us we lost our virginity to each other, we started dating in high school , we were always together, and tbh I don’t think he ever cheated on me, atleast not in the beginning of the relationship. I just want to know if you guys think this is his form of retaliating or finding a way to make him feel better about himself. PLEASE INFORM ME OF A MANS MIND !!