Poor widdle boobie had a hard time dealing with your anger? So you don't want details because you know they'll make you angry?
Look, I don't want to know details, but that's for my own mental health. And I was plenty angry without details. What I'm very concerned about is the power imbalance that seems to exist in your relationship. Why on earth are you trying to placate him, protect him from your anger? Honey, he should be groveling on his feet in gratitude that you haven't kicked his ass to the door!
He doesn't just need to deal with his problems dealing with your anger, he needs to deal with his PROBLEM, which is CHEATING.
I'm sorry, I'm probably projecting my anger here a bit. But please, please stop worrying about your how your anger affects the little precious, and start thinking about getting your bitch boots on getting widdle precious to man up.