Help husband with management weight

I am fine with his weight, he is the one that is telling me he is sad. He’s 6 ft probably about 240lbs. His goal is be 210. He goes running for miles every day. He also eats pretty healthy. I don’t work out with him because I’m lazy. He partially blames me because I don’t worry about weight and working out but am still relatively thin (skinny bitch- genetics). He has thyroid problems which is why I think it is harder for him. I don’t really know how to help him.