When you have been let down in a painful way in the past, you might have a tendency to fear a repeat of that experience. So, you paniced and pushed him away rather than risk the pain of a closer relationship. I think this is a natural tendency when someone has had a painful experience in the past. So, forgive yourself for panicing and see if you hear from him. I hope he figures out that it isn't about him. It's just the way the mind works at times. Hang in there and good luck.