I say just hang out with him with him and talk. If not just hang out with him while having a beer and enjoy the silence. Alot of times I'd shun away from people after getting hurt but eventually I'd want someone to talk to. You should be that friend who can be there for him. Initiate contact with him, dont let him wallow in his self sorrow for too long.

p.s. I think your a pretty good friend already since you'd come to forums looking to help your buddy out.