Should I ask my boyfriend to delete his ex's pictures on fb?

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Well my boyfriend had few months relationship that didn't end well...they ended up abusing each other etc..so I was going through my boyfriend's fb account a month ago and I saw few pictures of her...I asked him about her ..he got angry said nasty stuff about that girl and told me that he will delete those pictures...today when i just went through his albums again..i saw they weren't deleted..am I being too harsh? Am I asking for too much? Before we got into relationship I used to put my pictures up on fb but he didn't like it..he didn't consider it safe so i deleted all my pictures.
I don't know..will this be pressurizing him too much..help me..