My guy best friend has withdrawn, not sure what to do?

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I love my guy best friend and he knows it however, he is depressed and has withdrawn socially.
We usually talk everyday, but I have not heard from him in 3 days yet he can post statuses on Facebook. He is in in the military and holds a high position but he told me that he is stressed and works long hours. He is also going through problems with his immediate family and on top of that he has new problems going on in his life (personal problems which I will not post). I feel so bad for him and try to encourage him and told him if he needs anything that I"m here for him. I've always been there for him and we go to graduate school together and we usually work on assignments together.

I do not want to push myself on him and want to give him space, however I'm worried about him and I texted him Friday no response and on Sunday no response. I do not want to be intruding do I just wait it out until he comes around? I also have a feeling that he has feelings for me but afraid to tell me.

advice!