Why would a guy be mad that i'm ignoring him after he rejected me?

We went on a total of 3 dates, he rejected me, we agreed to stay friends. I didn't reply to his last message bc i don't feel like we should talk every day after that. Now he is the one being mad that i'm ignoring him even tho HE was the one who wanted this. Who understands men? Bc i don't.

Why would a guy be mad that i'm ignoring him after he rejected me?
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