Any break up is hard. And it is not dumb to feel the way you do. It happens to all of us. That is why some of the best songs ever written are about breaking up and dealing with those feelings. Some people end relationships with hate and pain, which is bad for everyone. It sounds like you still care about this person; that is a good thing, but don't wait for him to get back to you. Do what you can to be happy. It sounds corny, but you control the joy in life. If he ended it, do not feel bad about yourself. Music helps me deal with my emotions and to quote a song, "When in doubt, move on. The wind will sort it out." This means some things are out of our control, and all we can to is just live.
Take care