Boyfriends got pictures

Awhile back I went through my boyfriends pictures he’s got on his phone and he’s got 20 pictures of this girl he “use to game with” (from before we were together) both sexy and regular. And he just recently downloaded a picture of a girl in her underwear showing her butt. I’m starting to think he doesn’t find me attractive anymore and it hurts so bad. I just want to be as pretty as those girls he has on his phone. He hardly kisses me and cuddles me and has sex with me. Only when he wants to have sex.