Guy is making me confused?

I've been friends with benefits with this guy for a few months now. We have intercourse but we also go out to eat and watch movies together, we get along well and talk about a lot of things with each other, and I've met his parents as well. The other day he accidentally saw some nude pictures of me and my ex from years ago that i forgot i had. He got really really upset, I felt bad that he had to see those, and he said "Just delete those and we'll be fine."

What does this mean? Are we really just friends with benefits or is there something more? Why is he getting so upset about those pictures if we're just friends with benefits?
Guy is making me confused?
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