Fiancé gaining significant weight

Hi,

I hope this doesn’t come across wrong because I love him so much, but… I am becoming increasingly concerned about my fiancés health/weight.

He has steadily gained weight in the 2 years we’ve been together. He’s always been a bigger guy and I don’t mind that, I LIKE a bigger guy. And I’m a bigger girl! But looking inward, I’m starting to feel a little bit turned off now… as horrible as that is.

It’s to a point where his stomach now hangs out below his shirts because he refuses to acknowledge and cater to the fact that he has gained a significant amount of weight. (TMI sorry) He also squashes me during missionary, and during girl on top I struggle to be able to do what I need to do because he’s so wide and his belly is in the way. I can barely lean down to kiss him.

I personally am on a weight loss journey, I’m only just starting but have lost 6kg (13lbs). He eats what I eat for dinner, but not breakfast and lunches although I’ve offered. He starts and finishes work later. I know he eats out a lot and on the go, which I think is where the damage is being done. I always suggest we both be better (hence why I’ve started to lose weight), but he continues to gain.

He insists he just has always had a “slow metabolism”, because he has a labour intensive job 80% of the time and doesn’t lose weight. But he eats such high calorie meals. He thinks because he does 20k steps a day and lifts heavy things 5 days a week, he can eat 6,000 7 days a week and it cancels it out. He thinks it’s “impossible” for him to lose weight because of his metabolism but I call absolute bull on this because he’s never bothered to try.

I’ll stop rambling, I’m worried. When we cuddle I can hear his heart beating super hard like it’s struggling, he is starting to waddle with the more weight he gains, he loses his breath quickly etc. I want us to have a long and happy life together. I want to have kids we can both run and play with.

HOW can I sensitively suggest this is becoming a real problem? I’ve tried before in the form of suggesting we eat better and go for walks (both of which he agrees to at the time, then makes excuses not to do). I don’t want to hurt him irreparably but I’m lost. Please help.

Edit : I’m not talking a little bit of weight guys, he’s over 135kg or around 300lbs