Why did the last guy I hooked up with become mean towards me after sex?

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There’s this thing called post-coital dysphoria. It tripped me up the very first time I experienced it. You just shared a wonderful experience with someone, why do I have all these negative feelings?

My suggestion is to deal with it with humor and patience. I wouldn’t be surprised if mammals evolved it to encourage promiscuous mating behavior, thus ensuring more babies. Evil evolution!