<human>: Can you condense the text into three sentences or less?

I'm 23f, boyfriend is 24m. I'm not a crazy person, but I've always maintained a level of physical fitness with myself and eat pretty healthily (most of the time). My philosophy is that you get one body, so you may as well take care of it. It helps that I enjoy exercise.

My boyfriend has gained over 50 pounds in the past 3 years we've been together. We both used to be on a sports team in college, and that kept him svelte despite his poor eating habits. Since graduating, he spends most of his time sitting, hates exercise, and continues eating poorly. He did have a period where he lost 10 pounds, which excited both of us, but he seemed to lose motivation after that victory.

He doesn't like how he looks, but it's not motivating enough for him to change anything. I'm not less physically attracted to him because of it, but I'm worried that he's so young to have such unhealthy habits. But I AM less attracted due to his lack of motivation. He finds exercising with me frustrating because it shows him how far he's gone downhill. I don't bring up the issue with him, but when he complains about it, it's hard for me not to get frustrated because he's in charge of his own fate, and I know he can do it if he'd just try.

How should I approach this? Or should I do anything at all?
<bot>: Boyfriend has gained 50 pounds in 3 years. I'm concerned about his health, how can I approach it?*