Why should I let go?

Yup. That's my question for everyone. Why should I let go of someone I love? Yes, he dumped me. Yes, I know my worth. But our relationship wasn't toxic or bad. He just one day decided to throw me away like I was the easiest thing to discard. Yet, I know that he had his reasons. He's a kind person. So, why should I let go of him and hope?