I agree with Maleficent. If he is telling you that you need to lose weight, it sounds like only the beginning of a bunch of control problems he has. My fiance loved and respected me at my heaviest and loves me no differently now that my
body is changing.
You deserve that in a significant other. Drop him and most of your
stress about this will probably be gone - and then you can go about losing the weight to be HEALTHY and for no other reason but for YOU, as it should be. If you ever need to talk, I'm around!