Most Helpful Guy
I've never deleted photos of past relationships. I had those experiences and have every right to those memories.
But I might not make them PUBLIC after a break-up. Such pictures can lead to a lot of misunderstandings and false assumptions from others, especially those who aren't close friends or people you may potentially date in the future.
Some people may also have a hard time looking at those pictures after a break-up without getting sad/upset, even if the break-up was mutual. By hiding/deleting the pics, it helps them have space.1
Most Helpful Girl
because she can!1