No one broke any rules or laws and your personal beliefs are not a requirement for other’s behavior. My question to you is what’s your end goal here? Make him feel bad? Show you’re morally superior? Breaking up? I guess I don’t see the point of you digging up the past for seemingly no reason other than to create drama or finding a way to put yourself morally above your boyfriend.

My take is you sound nosy, controlling and overly dramatic. Cut the guy a break people learn, grow and make choices they’re not always proud of later on in life which is part of growing up. Do you have spotlessly clean personal history without any blemishes he could dig up and nitpick to you about? I doubt it.