My bfs friend is sending him nudes of girls some is someone they know

So my bfs friend is in a relationship but he still sends nudes to him and another friend of theirs (they’re in a group chat together) and my bf knows I don’t like when he doesn’t that and he’s told him along time ago to stop bc I don’t like it but he still does. Today I seen that he sent him a video of some girl they all

Know and used to hang out with and it’s really bothers me bc he’s in a relationship himself so idk why he keeps sending them. Am I overreacting? What should I do?