Why do people keep in communication with exes, seek friendship with them or want to establish communication?

An ex is past history. You cannot heal or expect to move on if you are communicating with an ex.

Also, if you get into a new relationship, your new partner won't like the fact you talk to or hang out with a person you used to have sex with.

It's best to cut this person off completely. Heal and move on.

But why don't people realize this?
Why do people keep in communication with exes, seek friendship with them or want to establish communication?
Post Opinion