AIO for catching bf on adult sites

I 18f fell asleep after a long day of work and woke up at 11pm. My bf 20M stayed up playing some games. I checked on him and told him I was still tired but not sure when I’d fall back asleep. He still stayed up and went back to bed, I couldn’t fall asleep so I went down to see him at 1am to maybe play some games.
I walk in and it looked like he was on FaceTime(found out it was the video style since he was playing with himself of people having phone s*x.) I started crying and was like tell me the truth. Because he quickly closed his apps. We never established that this was cheating so I feel like I can’t be upset, but I still was crying, and now today I’m so depressed and distant towards him. He says he’s never done this before, and that this was the first time. And I feel like I should let him because he lets me read smut (but I don’t touch myself, if anything it makes me want to do more with him) AIO?