My boyfriend says he’ll leave me if I get fat?

Today my boyfriend told me he’d leave me if I get fat. He says that it’s not fair to a partner to let yourself go and not take care of yourself. I agree with that sentiment, especially if it puts stress on the relationship.
But what are your thoughts? A part of me thinks it’s superficial. Another part thinks that it’s fair.
My boyfriend says he’ll leave me if I get fat?
Post Opinion