Why do people become so cruel when they don’t care for you anymore?

You know something I realized as I’ve gotten older is how fake some woman can be now what I’m gonna say can be applied to men too but I’ve only dealt with woman so that’s what ima speak on. But I’ve noticed that once a woman stops caring they can be so cruel it’s crazy to me to think that someone only ever became my friend and was nice to me and I’d all these things cause they just liked me romantically but as a person they couldn’t have cared less about me. I know this cause once things don’t work out even if I do nice things for these people or worry they treat my kindness as a nuisance and ignore my presence half the time. Depending on how things went obviously the reaction might be warranted but in other situations where it didn’t go bad it can be just heartbreaking to realize you were nothing more but an object of someone’s affectionate that they got bored with. Guess you don’t know if someone really cares till you get to the bad then you see who is really with you or not.
Why do people become so cruel when they don’t care for you anymore?
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