worried about a girl

so my boyfriend of almost a year is in a Facebook page and talks to a bunch of people in the group. that's fine, whatever. but he talks to this one woman a lot and hes never met her but I've told him how I feel about him talking to her but he still does and i NEVER go through his phone, I trust him, after all we live together but I found pictures shes sent him that hes saved. nothing bad or inappropriate but just has them. but doesn't actually have a lot of pictures of us or me. should I message her and tell her to leave him alone that it upsets me or just talk to my boyfriend.

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