Why is he critical of my appearance?

So, my boyfriend is very weight conscious. I'll be honest, I struggle with mine. Always have. We have been together a long time. I know he still pines for his ex girlfriend from his college days. she's married now. Two kids. I saw a photo. She's overweight and not aging well. And he's pining away for THAT. While trying to tell me how I should get into better shape. Wth? How does he not see the irony?

Why is he critical of my appearance?
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