That's not an unacceptable behavior. I don't accept his reason that the relationship is interfering with his studies. The best he could to ask to go slow in the relationship. Lack of receiving your calls or replying to your texts, then saying you shouldn't leave him when you meet doesn't make sense.
What he might not realize is that he is hurting and confusing you. He sees no problem with his action but it isn't acceptable.
You have to make your stand. You have to make it clear to him that you are a human being with feelings, a life to live, goals and dreams to fulfill and things to do. He can't say you shouldn't love him when there isn't any communication. You can't sit down through the whole semester waiting for somebody who is blaming the relationship for interfering with his studies.
It is true a relationship can interfere with studies or jobs. However, cutting communication isn't a viable solution. It is outright rude.
Send him a text since he doesn't want to receive your call. State the facts. Tell him you have to meet to discuss the fate of the relationship. If he doesn't respond, better forget him.