How can I help him?

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My friend's dad passed away in December. I was away on a temporary assignment for my job and I just got back last week. We had spoken on the phone various times while I was gone, but he never brought the subject up. I didn't want to push him to talk if he didn't really want to, so I never brought it up either. Now that I'm back we've been spending a lot of time together, and I starting to get really worried about him. He's been drinking a lot. He goes out to the bars almost every night, and when he doesn't go out he drinks at home. He barely gets any sleep at night. He's spending money like crazy buying tons of extravagant new things for his apartment. He's mentioned to me twice now that he's sad, but he won't talk about it. He even deleted his entire contact list from his cell phone so that he can't call anybody when he's sad. He says he doesn't want people feeling sorry for him and he doesn't want his friends to be worried or sad for him. What can I do? How do I help him? He won't open up. He's putting on a brave face to the world and pretending to be just fine, but he's hidding his true feelings. I understand that it's normal for him to be sad and he doesn't have to talk to anybody if he doesn't want to. But he's hurting himself, and I'm really worried. Any suggestions?