GUYS? Please help.... is it reasonable for me to be a little bit upset?

Maybe he's just run out of things to say. You don't have to talk every day. Is he always the one to end coversations? If so, you should make an effort to be the one to say "bye" first. Also, make sure not to call every night. He'll be more inclined to talk to you and less inclined to leave you hanging if he doesn't know how long he has to talk to you or that you'll be there waiting for his call the next night.