It isn’t clear from your post if he cheated on your while you were dating, or if he was having a lot of sex with different people after you broke up, and you’re upset about his character.
If it was the former, then be glad you’re broken up! I never recommend being friends with an ex, so this is a good time to let go and really move on. If he was cheating on other women after the two of you broke up, it’s really none of your business, and all the more reason not be friends with him. There are many reasons that people cheat, and it’s important for you to try your best to be a good judge of character so you don’t find yourself dating a cheater.
I hope that helps.
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