Need different opinions

So I have been with my boyfriend for a year and he has a 3 year old daughter and I found in his computer pictures of his daughter when she was born and videos of the baby momma during the Drs visit and stuff like that, pictures showing her breast and and almost naked pictures and I asked him why he still have those pictures and he told me that since he doesn't see his daughter now he wants to show her those pictures when he finally get to see her again and honestly I don't wanna be selfish but it bothers me knowing that he has those pictures should I make him delete them? Or delete it myself ? What should I do ?