Is it inappropriate to keep pictures on social media of you and your ex kissing?

JD
My bfs ex still has TONS of pictures on instagram and Facebook of the two of them kissing. She cheated on him and has been with the guy she cheated with for over a year now. She does post pics with her new bf, so I'm wondering why she can't go back and delete the old ones. I'm just curious why she wouldn't want to delete at least the pictures they are kissing in? Yes I know I sound like a stalker but aren't we all a little bit?