<human>: Could you distill the essence of the text into 1-3 sentences?

My boyfriend has struggled with weight issues his whole life. For most of his life he was overweight. Then he was in an abusive relationship where his ex would make jabs at him for this and tell him that as long as he was that weight, he'd never do any better than her and that no one else would want him. He lost a lot of weight before I met him by busting his ass at the gym at all hours and eating really carefully, but he still struggles with issues tied to loose skin on his chest. 

To me, I have never seen his body as anything other than perfect and it hurts me that he can't see how gorgeous he is. He has become scarily upset this week when he found out he gained back 20 pounds. He's convinced that I'm going to leave him over this because he can't shake the thought of not being good enough. He's the best thing I could have ever asked for or imagined and all I do is try to make him see himself through my eyes. There's never been a time when I haven't been attracted to him and that would not change over weight. 

How can I help him feel better? He has been so disconnected this week and I feel like I'm being cut out. I just want to help.
<bot>: My boyfriend recently put on 20 pounds and is convinced I'm going to leave him over it. I find this absurd and just want him to feel better. How do?