How can men be so cruel?

The saying that it hurts when one minute you're close and next you're strangers really hits me.

I was seeing a guy for a while and we broke up because and not in the best way. I still know how he gets and how stressed he gets so I texted him to see how he's doing. I wish I could stop caring about him and he knows I care too. But no reply from him whatsoever. So that saying that you're now strangers is so true and hurtful.

How can people be so hurtful that way? Esp if I wasn't in the wrong..
How can men be so cruel?
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