AITAH for getting upset with my boyfriend after he told me to lose weight

Me (F24) and my bf (M29) have been together for a while and he knows my history of having anorexia/severe body dysmorphia when I was 16-20 years old. Today we had a conversation about how we've been planning to exercise together because it would be such a nice hobby together. Although the conversation went into body types and I got offended when he told me that he would like me to lose some weight. I asked several times if he's seriously telling me to lose weight and he said yes. I started crying and felt worthless and explained him how his words hurt me but I didn't get any apology, just a smirking face from him saying that I shouldn't be so sensitive and that he did nothing wrong. After that I pulled on the most covering clothes I own and made him some breakfast and didn't eat anything myself because I felt so uncomfortable around him.

In case you guys are wondering, I'm normal weight, gained a few (~5) kilograms after coming back from military in 2022 but those kilograms are long gone. I'm size S-M and I have curves on my bust and lower body, but under no circumstances that's anywhere near fat so am I the asshole when his comments really went under my skin because of the past (which he knew about)? He also knew that I'm still suffering from the body dysmorphia.