Why do guys cut off all ties?

Anonymous
I know some girls cut off all ties with their boyfriends but I want to know why some guys do? I mean I don't believe in friends as an exes only if you have kids and sometimes that can be impossible for people. I mean an occasional, how are you or maybe a happy birthday...how can people be so cold and just never talk to you again...Why do guys cut off all ties? Is it because they never cared for you? thoughts?
Why do guys cut off all ties?
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