My boyfriend has been saving other girls photos: Advice?

Like all men , my bf likes to look at pictures of other women. You know, bikini pics etc… which is fine I don’t care about that. He’s just looking right?? But I just found out he’s been saving these pictures or videos of other girl like on tik tok that he finds, and one of them was of his ex. He’s been Saving a lot of them to his camera roll. And to me I don’t think that’s right… if you want to look then look, I know he’s not blind. But what’s the point of saving them?? He has pictures of me so he does he feel the need to save other girls pictures ? I asked him to delete them and he did. But he said I was over reacting about it… am I?