Why do some men use women as back up plans?

Or think they can walk into a woman’s life like she’s a revolving door. No man has ever been that lucky to use me like this ( not a text or phone call ) I usually ignore their texts and phone calls if they do they call or become extremely busy after no communication for a while.
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Sorry if I sound like a cold and conceited bitch - I’m the nature of not giving af and won’t be used as a back up plan for a guy that thinks the grass is greener on the other side
Why do some men use women as back up plans?
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