Talk to him. If it seems like he's trying not to cry, tell him its alright to cry.
When my friend died, this guy named Mike (who I barely knew) sat next to me for hours and hours holding my hand listening to me talk about how amazing Jason(my friend who died) was. and that made me feel much better.
im so friggin sorry for you and your friend...**huggles you and your friend** hope everything gets better...if you need to talk to someone, talk to me. im always online. my screennames are at the bottom of my profile