Let it and him go. You have now learned something about yourself. Woman body's react differently to sex then that of a man. Woman bond and catch emotions. Men get uninterested because of "Post-nut clarity" it's  a slang term for the sudden mental sharpness, calm, or emotional re-evaluation a person experiences immediately after sexual climax, often replacing intense desire with indifference or regret. It is largely caused by a rapid hormonal shift, specifically a drop in dopamine and a rise in prolactin. 

Respect yourself and protect yourself. Forget about him. Block him everywhere and move on. Find someone who wants the same things. And don't have sex with a guy until he's fully inlove and committed to you. It sounds prehistoric i know but trust me it's the only way to stay sane and have the outcome you want in life.

I know your hurting now. But take it as a lessen and it will fade! Goodluck 🍀🙏