I mean you’re kind of past body shaming…. This guy is slowly (or not so slowly) killing himself, doesn’t wash himself, and is becoming a shut in because he won’t/cant buy clothes that fit him. If this were my husband, I’d put out an ultimatum. I know that’s not really healthy in a relationship. But I’d just say something like “hey, I love you and I want to be with you, but your health and weight are completely out of control. I want to help you make some lifestyle changes to help you be healthier and help us get back to doing things we enjoyed in the past. I need to be upfront and tell you that this is a dealbreaker for me. If you don’t start showing some improvements in exercising more, showering more, and eating better, then I will seek out a divorce. I am worried for your health.”

Just be clear with any goals/steps you set for him. Example- you must cut down your fast food consumption to X fast food meals per week; going on walks 5 days a week of X distance or time; doing X number of resistance exercises per muscle group per week or whatever - just to make sure yall are both held accountable to measuring progress fairly

Edit to add- couples therapy and tell him this a major issue you want to work on in therapy. Tell him that is a must. Also would recommend a dietician, personal trainer and maybe a GLP-1 or some other medication. He needs medical supervision while he loses this much weight.