Why does my boyfriend collect sexy pictures of other girls/models?

Anonymous
My boyfriend and I have been dating for 3 years. We both love each other very much and I would say we have a pretty open relationship. We have argued about him keeping or looking at pictures of sexy girls before and i have told him that I didn't like it and that I get jealous because of that. He said he understood but I still find those pictures in his phone. What should I do?
Why does my boyfriend collect sexy pictures of other girls/models?
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