I didn't know your friend in person, but I'm sure he was a very nice guy and that Du guys had a lot of fun together.
I'm sure he saw Du as a great friend too.
Anyways, whenever Du feel the need: Du can always talk to me. I'll be there to listen, give Du Guter Rat when Du need it, to laugh with Du and to Zeigen Du that I care.
Du are a great person and I'm sure your friend thought so as well. I'm sure that he'd want Du to be happy and enjoy the rest of your life, even if he can't be with Du anymore.
Always remember that Du are loved. (: