You have always liked Dean and the fact that he was blind didn't change that, however, you knew that he wasn't happy and all he wanted was to see like most people.

Wanting to prove how important he was, you decided to donate your own corneas, so he could see, even though it meant losing your vision forever. 

Dean recovered well and one day he decides to visit you, you no longer see him but hear that voice that you loved.

"Now that I can see, I don't need you anymore. Forget that I exist."