Yo do I need to chill?

Okay so long story short I've been dating my boyfriend for 7 months and we're very serious. I love him and I know he loves me very much and there's no doubt there. We're a happy and healthy couple. The only thing that kind of bothers me is that he's kept pictures of him and his ex together on Facebook (they dated for over 2 years and broke up over 2 years ago and he claims that he's 100% over her) and hasn't taken them down because he "looks good in the pictures and has no feelings for her". Is it pretty normal of me to feel slight concern about this? I mean if I were looking at this from an outside POV I would totally tell me to talk to him about it (which I have done and nothing's really changed except a few pictures were taken down). Am I being overly jealous or do you think I should say something again?