My grandma passed away last month after being married with my grandpa for 54 years and I'm worried about him. Advice?

So my grandma passed away of leukemia last month after being married with granpa for 54 years. They met when they were 16. He fought in vietnam,then he went into hardware and had a hardware store. He says he's fine but I'm not so sure about it. He's a Marine, he's tough,I never saw him cry,but I... show more So my grandma passed away of leukemia last month after being married with granpa for 54 years. They met when they were 16. He fought in vietnam,then he went into hardware and had a hardware store. He says he's fine but I'm not so sure about it. He's a Marine, he's tough,I never saw him cry,but I know he misses her. He never talks about her. He hasn't even mentioned her yet since her funeral. He seems happy on the outside and frequently smiles but I'm worried about him. How shall I help him?
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