Why does my girlfriend still have contacts with her exes?

Well she doesn't text them or anything, but she has sent her priavte pictures to them, and when I sneakily checked her snapchat one day, I found out her pictures are still saved in chat, which are not really "clothed" , but I didn't delete it or she would've find out.

She doesn't talk with them anymore, nor has since we have been in a relationship, but should I mention it to her? But Im scared she'd find out I checked her phone
Why does my girlfriend still have contacts with her exes?
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