<human>: When I got home from work last night I noticed my boyfriend (of 5 years) left his second monitor on in his office. I went upstairs to shut it off but noticed his laptop was also open with a lot of porn tabs opened— whatever I thought, it's just porn. But then I noticed that he had another folder open that had a lot of nude/sex photos. I, being nosey, decided to scroll down to see what else was there. Nothing too out of the ordinary— just some tits and ass, among other things...
 

I continued scrolling and was shocked to find HUNDREDS of photos that he had saved from Facebook of girls that I know, not to mention a few of my old best friends. The photos ranged from innocent portraits, to provocative photos of girls in sexy costumes, lots of cleavage, bikinis or making out with their other girl friends. There were also quite a few photos of girls who are considerably younger than he is. 

Nude photos/porn is one thing, but having fap folders full of people I know just takes it to a whole other level. I feel as though he crossed a line. It didn't do very much good for my self-esteem either, I feel as though I may not satisfy him enough, or that he's getting bored with our relationship etc.

I confronted him about it and all he said was, "I don't know why, I just do it." He then went on saying that he doesn't actually masturbate to it... But I'm not sure how much I believe that, why would he have them in the first place then? I just can't understand the reasoning behind this or why he does it... is this a normal thing for a guy to do? Am I overreacting to think that it's incredibly creepy and weird? 

Men of reddit, please give me some insight on the way you guys think and why he might be doing this. Women, what would you do/how would you react in my situation? Any advice would be very appreciated!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: I found hundreds of provocative photos of girls that I know on my boyfriend's computer that he had saved from Facebook. Is this normal? Am I overreacting to think it's incredibly creepy?