Boyfriend HELP?!?

Okay so basically i found out my boyfriend was watching porn behind my back because he had some private browsing app?! Puffin.. anyway I found out and I asked him 5 times and each time he promised that he didn’t.. he admitted in the end that he did. HELP what do I do? I know there are different opinions about porn and stuff but I’m really insecure about my body and it makes me feel as though I’m not good enough because we had done stuff the day before.. help me out ladiessss