Boyfriend 187,135kg, very thin. He always accompanied me when I was 163,120kg. After being together, my weight is still rising, and he has not abandoned me. I was starving when I was losing weight. He advised me not to lose weight, just to be healthy.
In short, it's not worth it. The boy you described seems to pay attention only to appearance, but not to lover.
But you deserve to lose weight for yourself. After all, it will be more beautiful and healthier.