Should I stay with my boyfriend

My boyfriend and I have been together for over a year everything was great he was amazing until we started to have problems in the bedroom he wasn't pleasuring me anymore at first I didn't say anything but I got really annoyed and finally said something but not in the best way in the middle of having relations he got very upset and things were a little awkward but we moved past it or so I thought. He started to message a girl it only ladted a few dats they sent eachother nudes but it didn't go past that he imidately cut it off after the day they sent the pictures because he said it made him feel like less of a man and he was trying to feel like a man again but I only found out because the girl sent me proof I broke up with him I was so angry but eventually I decided to try it again but the girl kept sending me messages saying he was still trying to talk to her but he denied it all and she wouldn't send me proof like the first time I'm so lost and confused

what would you guys do in my shoes?