Would you give your boyfriend a second chance after this

So my boyfriend just confessed to me that he slept with another girl when we brokeup a long time ago the breakup lasted like 3 days and with no contact, i don’t remember why we brokeup but he doesn’t remember either he just remembers it lasted 3 days. he told me who the girl was and i have no idea who she is but it was some girl on his old instagram. he told me while he was having sex with her he couldn’t stop thinking about me and he told her he couldn’t do it anymore and when he stopped the condom supposedly broke.. but anyway he never told me, to not hurt me and not keep it a secret forever because i deserve to know the truth. He also feels like we are at our strongest moments in our relationship so he thought him telling me would make me forgive him and fight through this. I already told his mom and his cousin and my bestfriend and my mom what he did lol. I feel like a hypocrite not to mention because when me and him started dating i messaged my ex asking if he still has feelings for me because i needed to know and till this day he forgave me but he still brings it up here and there. I told him what he did was cheating but he says its not because we werent together.. it was 3 days tho 3 days .... he couldn’t show up to my house and talk to me if he really loved me? Idk i guess men and women think differently and are wired differently. He cheated on his ex in highschool with more than 1, but in my case he slept with someone when we brokeup. I’m so lost What do i do?