He’s pushing me away while grieving what should I do?

I've been talking to this guy for months, he was there for me when I was having a tough time. His gran was rushed into hospital on Christmas Day and I've tried to support him. She passed away 2 weeks ago, he was carrying on as normal as if it never happened, still going to work, not taking any time off but it was the funeral last week. Ever since the funeral he's hardly been talking to me, I've tried being there for him and I told him he can talk to me about anything if he wishes to do so, he replied 'I know you're always there to talk' tonight he messaged me saying 'I need affection beyond belief' I don't understand what that means as it could mean anything from a hug, sex or something in between. I told him I'm here for him but he keeps pushing me away by ignoring me and he said 'I don't talk to anyone. I work and sleep that's all I'm capable of doing at the minute. Sorry it's not you' I understand grief affects people differently I just really wanna be there to make sure he's okay and to look after him but I don't want to come across as too full on or push him further away, is it best to leave him alone even though he's bottling things up? I said to him there's more to life than just work and his reply was 'I'm aware, just haven't figured that out yet' if I leave him alone is there a chance he will come back when he's ready or should I encourage him to open up??