Taking back a cheater

So I just found out my boyfriend of 3 years had cheated on me supposedly a year ago. My friend works in the findom community which is something like onlyfans where men pay for sexual stuff like nudes and whatnot... my friend found a picture of him soliciting services for a domme... and when we talked he admitted to getting involved with stuff like that with four girls a year ago when me and him weren’t in a good place. They were all transnational and he didn’t physically cheat on me. He swears he hasn’t done it since because of guilt and I’m probably stupid but I think I trust him?.. I know lots of girls take back cheaters I just didn’t think this would happen to me.