Fb messages.

So I've been kinda upset lately and I'm coming to all of you because idk if I should be, if I'm over reacting be honest and please tell me. Sooo I was on my boyfriend messenger to find a video he sent awhile ago and upon going through messages to find it I see that him and his buddies have been sending videos of girls masturbating.. or showing their boobs.. Or pictures of tits, they're like those chain pictures.. And it really bugs me. I've tried saying something but he says it's no big deal, it's not like they're people he knows.. But still. I look nothing like those girls and it makes me feel like shit..