Boyfriend looks at other girls

So tonight I was talking to my boyfriend and he said he was deactivating his Instagram. I got upset and asked why because we always send posts back and forth, literally every day.

He admitted that he would sometimes scroll through the discover page and end up looking at girls that he shouldn't and felt guilty because he just wants to look at me. So he wanted to delete it so he wasn't tempted.

I feel like I should be happy he at least told me but I feel like shit. I'm pretty sure he was looking at models and stuff. He knows I'm very insecure about my body.

What should I do..? He's never done anything like this to me before, he's always treated me so well.

For reference, here's a few pics of me. Am I fat and/or ugly?