He needs to grow up and move on as you will in years to come.
Even though he is at university he will still come home, and you will also be able to contact each other via email and even video conferencing.
Maybe you will even be able to visit him at his university and he can take you round and show you the university and local area.
If ever you become a parent you will have the same problem, your children will grow up and eventually they will want to leave home. It is something you have to accept.
Life is constantly changing and we cant lock it in a "bubble" and hope it never changes.
You need to think about how YOU are going to get to university as there is no doubt a university education is of great benefit all your life.