Mostly I think a man is unwilling to do relationship talk because they fear that they would be put into a situation were they feel they now have lost control. Being a man myself there have been several situations in my life were I have expressed my feeling to a woman and then later felt as though she used those feeling to manipulate me. Or the other case of the chase is now over so why should she put in the effort.
Best advice is you go first, you tell him how you feel about him. You might have to do this a few times before he becomes comfortable. Next mention to him that it is important to you that you understand were this relationship is going.
If after that he still won't open up about it, it is really time to think about moving on you are with a very selfish man and there are much better ones out there that want to love you.