Deglorious,
Many can understand it from his view in part or whole -- and many others probably can't. Most who are mated don't want to see forced change on or in their partner. They don't want to know that the other has to be tethered to a machine and wear a mask, and have the machine running all night pushing air to them. For some that can be hurtful to the image of the love. But many others adjust and accept such things with little flutter about them.
Has he truly faced this in entirety by imagining himself in your spot, and you in his? For some that works to bring or return some balance.. and for others it makes no difference.
Losing weight probably would not negate the need for PAP therapy anyway. but it could make it easier for you get great therapy at lower pressures etc. And maybe even lessen or resolve other health and energy issues.
I feel for you, and hope you two can balance it all in a manner that brings you closer together, in support and understanding.
While not ideal or healthy, so they claim, I'd rather remain alone than to ever again have someone stab me with their ego repeatedly. And certainly not when what I need most is support, encouragement and reinforcement of the love.
I admire any who share in a really great union, regardless of what title they call that togetherness.
Nodzy