Why are men so jealous? Why can’t they just accept the honest truth and move on?

From the very beginning, I told him that I don’t want a serious relationship. I just want to have fun. He and I have sex and he knows that I have sex with other men not just him. When I finally decided to stop sleeping with him, he acted like I mislead him all along.

Why are men so jealous? Why can’t they just accept the honest truth and move on?
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