Boyfriend wants me to lose weight

I gained some weight recently.
My bf made some comments about it and said he would be happy to help me losing weight. Then he asked several time when am I starting the diet.
It makes me feel extremely hurt. I know that he’s right and I need to lose some weight but the fact that he’s repeatedly asking makes me think that his love is not unconditional and that if I gain weight he’ll leave me … It makes me not want to start losing the weight … I don’t like to feel forced to lose weight for someone else …