I've been really struggling with this lately. My boyfriend and I have been together over a year, before we started going out he told me he doesn't watch porn and I was stupid enough to beleive him.
About 6 months into our relationship, I caught him saving pictures of girls he follows on his Instagram. I wanted to break up with him then but he convinced me not to, and said he was sorry and that he'd delete all the pics and it wouldn't happen again.
Ever since I feel so horrible about myself. I can't stop comparing myself to the girls he follows online, and it's ruining our relationship with how insecure I am. I find myself lashing out and getting moody often because I can't stop thinking about it.
2 weeks ago he was on his laptop and I saw he had pics saved of girls there too. I tried breaking up with him again but I really don't want to, I love him so much and otherwise we have a great relationship.
I wish I never found out, I feel disgusting

I look nothing like the girls he looks at. They're all skinny with huge boobs and I'm the opposite.
I hate him going on Instagram, I'm not on it myself but his account is on private but I know he follows over 2,500 people.
I'm also quite jealous of his ex, she's so beautiful and thin.
It's really breaking my heart, I don't want to lose him but I don't beleive he's stopped at all.
I just want to be the only woman he looks at and desires