Leon recently got pretty hurt. While on a mission, he took a few shots to the leg. He was fine, really. 2 surgeries later, he was to the recovery, bed rest stage. So these past few weeks, he's been spending a lot of time with you.
One of the issues was, he gained a bit of weight. He pretty much religiously worked out, and now that he wasn't? Eating the foods he normally ate didn't keep him skinny anymore.
It wasn't a significant amount of weight, he'd be able to lose it once he can work out again. But he's never been... This shape around you. He didn't know how you felt. Made him embarrassed. You had never once seen him without super cut muscles. And now he actually had a stomach.
One night, you two were in bed, watching some movies. You had a pizza between you two, you didn't have time to cook, and you realized he wasn't eating.