My husband is getting morbidly obese.

Me and my husband have been married for five years. He has always been a big guy, but the last two years he gained so much weight and I'm so worried about his health and heart. His mother passed away two years ago and that's when it started. He has been going to a therapist to deal with all those feelings, and he has my support as well as his family's. They are all very close. I have tried it all with his weight. I'm serving only healthy meals, but it doesn't help much because he'll cook a portion of meat for himself and eat that as an extra, so he eats two big meals every meal. He buys snacks and stays up all night eating while playing video games, So I can't "control" his eating. I've started working out and invited him to come with me, but he always has an excuse. I suggest things for us to do and try to sneak in some extra walking or so, but he's never up to do something, so I can't get him to exercise either. I've tried to ignore it completely to give him time and space to figure it out himself, I've tried hinting about him needing to get healthy , I've sat down and bluntly told him that's he's getting big and I'm worried about his health, I've talked to his family about it and they have been trying too. I don't know what to do anymore. Heart problems and diabetes both run in his family and I'm so worried. I get that he's depressed over the death of his mother and that it takes time to accept that she is gone, but he's slowly killing himself and it's killing me to just stand by being unable to do anything. Please give me some advice!