My boyfriend thinks I'll leave him if I lose a lot of weight. Why would he think that?

Anonymous
Okay, so we've both talked about losing weight. He brought up the fact that he needed to lose weight, yesterday. I said I'd work out with him so we would both be motivated. He told me he didn't want me losing too much weight because if I did, I'd leave him.

He knows I love him with all my heart and that I would never leave him. I told him that and he still thinks I would. What do I do? Why would he think that? Is he just being insecure?
My boyfriend thinks I'll leave him if I lose a lot of weight. Why would he think that?
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