I'm not familiar with the term clean eating. The name would suggest a diet free of additives and unhealthy processing, avoiding a lot of the things called junk food in favor of more natural, unadulterated foods. Is that it?
In early January my husband's doctor (and mine) told him his only real health problem right now is being overweight. She wouldn't recommended any pill solutions, told him to mainly focus on his diet.
It happens one of our best friends has recently developed diabetes, and now eats a controlled diet, with measured portions of natural foods. One simple rule is to eat nothing white, like bread, pasta, processed sugar, potatoes, rice, etc. But whole wheat bread & pasta are OK. Our friend lost 50 excess pounds doing this.
So my husband tried it, though not diabetic himself. He's lost close to 30 pounds in 3 months. But he eats a wide and tasty variety, and so he's really not making a big sacrifice, even the measured portion control not that awful for him. Nor is it very difficult to do, the foods readily available, just a matter of unlearning old habits for new.
Of course I'm doing the same thing, at least at home, because I don't like the idea of buying & preparing 2 versions of many foods, a mine & his. I'll eat what my husband eats, that's no sacrifice for me, either, and if it keeps him on this diet, and maybe helps me, too, that's a win-win situation all around.
Consider that if you live with someone, and usually eat together. If he's the one who needs to adjust his diet, then adjust yours, too, insofar as you can given any needs of your own. And while I'm not a fanatic about the foods I eat (I couldn't be a Vegan, for instance), I don't think a little common sense and reeducation is all that difficult.