Most Helpful Guy
Keep the lines of communication pen ad honest.
He is looking for consistency in your decision to fully commit, to assure himself that you are not going to have a change of heart when you graduate if he gives a relationship with you a second chance.
"What should you do?" Reinforce your intent to commit him as often as you can. Convey to him that he is the only guy for you and you both want the same in a relationship with each other.
He wants assurance from you, that's all.