He doesn't answer my calls?

Is your cell phone number blocked? If it is he could be screening his calls. If not, he probably wants to leave you hanging and make you wait to give him a power trip. Or if you call him too much, he does not want to be bothered and this is a way of showing it without hurting your feelings. He could also be with friends who may rag him if his girlfriend always calls him. He may call you back as soon as he is away from his buddies. it could be a million things. Hope one of these helps.