It means he doesn't want to play with you again, plain and simple. He could want to improve before facing you again, he might want time to go over your first game, he might be the type who prefers a random opponent each time, he might have to go do something in real life, and yes, he might even be afraid of losing to you again like you want us to say.
More or less the same can be said for the people who beat you and won't give a rematch. There's a variety of reasons, some quite legitimate, so you have to learn to just move on.
i played someone and beat him and he won't accept my rematch
what does that mean?
also i don't understand why players disconnect after they beat me and won't give me a rematch.