So he said he’s not mad I slept with someone else but keeps bringing up why?

The guy he’s talking about ended up being a rebound because I was so hurt that he started seeing and being intimate with someone else. We weren’t exclusive and he would tell me he wouldn’t be mad if I talked to other guys like he wanted me to. I ended up doing just that and hooking up with the guy and he won’t let me hear the end of it, it comes up from time to time. Once guys find out you slept with someone else is that something that devastates them and they can’t forget it? I just don’t understand why he’ll bring it up. He’s not mad he says but it clearly must bother him, why I don’t know. Help me understand guys!
So he said he’s not mad I slept with someone else but keeps bringing up why?
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