My boyfriend (32) told me that he no longer finds me attractive.

For privacy reasons, I created a new Reddit account to ask this question. To keep it brief: I'm 27, and my boyfriend is 32. We've been together for seven years and have two kids. I was in good shape before pregnancy, but I've gained 25 kg and I'm struggling to lose the weight. My boyfriend has repeatedly expressed his dissatisfaction with my appearance, saying I'm not attractive. He claims to love me and stay with me, and that I should be grateful for that. I don’t feel grateful; instead, it makes me feel insecure, and I can't understand how he sees me that way. We've been arguing about this for a long time, and I’m unsure how to move forward. During our fights, he hints at breaking up but then reassures me that he doesn't really want that. I'm trying to lose weight, but I struggle with emotional eating, and his unhappiness makes it even more challenging. Being thin has always seemed to be important to him, which feels like a betrayal since I gained this weight while carrying our children. I know I made poor food choices, but my emotions were all over the place during pregnancy. I'd love to hear your thoughts. Is he right? Am I overreacting? Is he being insensitive? I'm feeling really lost right now. I'm 156 cm tall and currently weigh 83 kg.