Instagram models

Hey guys I’ve been with my boyfriend for 3 years now and in the past he’s had an obsession with Instagram models/only fans girls. I found out how bad it was and I caught him lying about it saying he wouldn’t do it again and sure enough he did so I was like aight Imma fuck off and leave but he swore on his moms grave he wouldn’t do it again and that was that up until now I have strong reason to believe he’s doing it again. If you was in my position what would you do? I made it very clear I’m against it and he keeps doing it and it’s making me feel worthless and unattractive 😭