My boyfriend has a problem

I don't know if this is a guy thing. But this happened. And it makes me feel very insecure... So last night I forgot about am assignment that was die in a hour and I always sleeping over at my boyfriends. And I asked him if I can use his desktop. He siad okay and fell back to sleep. Shortly after... I saw tons of naked women on his desktop... Idk ... Were still months in. I dont know how I feel about it. And makes me question if he really likes me amd not an image. These girls have really good bodies. Its. Really intimidating.... Should I just stop over thinking... The more I do the more I feel unattractive and well insecure.. Help. Is he just with me for the sex??