He has a girlfriend

This boy was snapping me and I had a shirt off, it was nothing big, but then he asks for tit pics... I asked about his girlfriend and he said she sent pics to another guy, so they’re even. I told him twice that I don’t think she would like it, but he kept insisting. I sent it, and he started feeling guilty saying he never does that and he was loyal for a year, I asked if we could act as if nothing happened, he said yeah, don’t reply back tho, he needs to log off for awhile. I feel like a disgusting pos. Help. Note: I was on Snapchat, so all texts deleted, and I have no idea who his girlfriend is:(