Am I wrong if I asked this question to my boyfriend ( weight gain question ) ?

I been with my boyfriend for 12 years so I assume I can ask or talk to him about anything.
I’m not over weight if anything I’ve always had trouble gaining weight. I’ve always liked my body but I was skinny back then 100 pounds when I meet him. During the years I gain weight to 115 to now 120-125 I’m 5’4 and I’m happy I gain weight and have some meat in my bones. This have came with alil tummy and alil double chin but nothing mayor. My boyfriend knows the weight I’m in im happy but there was this other day where I asked him. “ what would you do or say if I get fat “? And he always seems to get bothered and he says “ well is not going happen or say he wouldn’t care and he also said that I wouldn’t get fat ( which I don’t want hear that ) I get bothered and tell him so… you wouldn’t tell me to lose weight or try motivated me to be healthy? I mean he knows I rather hear the truth than be lied to and if he had to say this I would appreciate that. ( not saying this is the case right now )

so we basically got into a argument and I got upset because I accused him of being fake or that he would just let me let go of myself and he would just stay quiet. I told him I would have rather hear him say that he would be supported and try to motivated me to lose weight. But was asking him this question?

Am I wrong if I asked this question to my boyfriend ( weight gain question ) ?
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