Was I wrong to be upset at him?

Last night, I caught my boyfriend on Google images looking at bikini photos of a girl I went to college with. (She's a beauty queen, so they aren't hard to find.) This is like the fourth time I catch him looking at her.

After it happened the first time, I told him it made me really upset and uncomfortable and for him to cut it out. I know it seems prudish of me to dictate what he can and can't look at, and I know men have needs, but it's extremely icky to me that I KNOW her. (We aren't friends or anything, but it's still weird.) It bothers me when I catch him looking at random women, but not nearly this much.

I've cried for hours every time after catching him. She's a beauty queen. I look nothing like her. She's tall, tan, thin, toned, and absolutely stunning. I wind up Googling images myself. It makes me feel so worthless and insecure, as though I'm not enough so he has to get off to this other woman.

Last night, he actually essentially said it was my fault for "putting her in his head" since the first time he looked her up was after I said something about her. He says that it's no big deal, that he loves me and is good and faithful to me, that he comes home to me every night, and that I'm overreacting. Thoughts?

I need your help.