Spouse weight gain

My husband has put on some weight in the past year. He used to be very trim and now I don’t like the look of his belly. I realize that his weight or appearance is a neutral circumstance. But I prefer him leaner and I don’t know how (or if I should) change that view. Here is my model:
C: Husband weight has increased x amount
T: I don’t like the way he looks now
F: Disappointed
A: Overfocus on how he looks, generate more unhappiness/dissatisfaction in myself, don’t feel as attracted to him
R: I magnify my disappointment

How do I change how I feel about this?