My partner (M25) gave me his honest reaction to my (F20) body

I was talking to my partner about how I had cellulite, even when severely underweight. The context behind this was because during a time I was fit and curvy, I still had cellulite. He had made comments then as I had gained too much weight, based on cellulite, despite me having it at any weight.
I was recovering from an eating disorder at the time, and I was very proud of the body I had. Until it was mentioned I had gained too much. I slipped back into an eating disorder, and I was trying to get out of it by mentioning I'd have cellulite either way, and I'm still healthy. Well, my plan didn't go as expected. He gave m his honest opinions.
"Oh my God, how could you let yourself get to that point?"
"It just sucks"
When I said that I was sorry for having a ****ed up body, he responded with, "It was beautiful, it was your mind that ****ed it up''.
He brought up that my self harm scars were the equivalent of me getting cellulite. When I tried correcting him, that my sh scars were the cause of pain, he said it was stupidity. And that gaining cellulite was a form of self harm.
He tried to make me feel better by saying there are ways I can get rid of it, but I eventually had enough and told him that he's the only one concerned about my cellulite.
He told me in the end it doesn't matter, but he's already given me his honest reactions. That, and he said that cellulite reminds him of his grandma.
I feel so insecure with my body now, and I don't think I ever want him to look at my ass-- let alone my body if I gain any weight.
What should I do to feel sexy and secure in my relationship? Or how can I get past these comments and gain back my confidence?
TLDR: My partner made negative comments about my cellulite / body and it punched my self esteem in the gut.


Source.