Guys, Why are some men like this?

Anonymous
I am 24 years old and the first guy I had sex with was 2 months ago. He is a guy I used to know when I was a teenager and we talked really little. 9 years later (2 months ago currently) I contacted him again to talk. He is in a 10 year relationship with his girlfriend. And was with the same girl 9 years ago (when we first talked). I always felt he liked me.. he was really sweet. He didn't seem like a fuckboy and thats why I was always attracted to him but realized only when I was 24 that I asked him to have a casual affair. I knew he had a girlfriend. But I told him it was just a casual thing and knee he would accept because I knew he found me at least pretty. The thing is, he explained to me about his relationship and after some talk he accepted. We met twice. The second time we had sex. To sum up, I haven't talked to him for 2 months now becaude he ghosted me. I confronted him by doing somethong bad (liked his girlfriend' tweet) and he told me he was angry, we talked and he told me his girlfriend read some messages that a lot of things happened and I told him I found his explanation disgusting that he didn't love anyone not even his girlfriend, that was the last time we talked. I basically told him I hated him. Because even if I knew it was just a casual thing.. he shouldn't have left without saying anything. It hurt my feelings.. I really thought he felt sth for me.. he didn't seem like that type of fuckboy. my question is.. if he chose his girlfriend. If he is still with her, why does he cheat on her? Is he stupid?
I told him these things. When I proposed him to have s. I asked him why he was still with his girlfriend if he desired to be with other people sexually.
Guys, Why are some men like this?
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