Am I being too sensitive

So the other day I jokingly asked my bf if I was the prettiest girl he ever seen, he said I’m the second prettiest girl he’s ever seen. (For a second I was like 😟) Then he proceeded to say the prettiest girl he ever seen was the healthy version of me. I didn’t know what to say to that. Then I told him he made me feel bad by saying that. He apologized. I know he’s worried for me , but I already stopped losing weight and I’m trying to get better so him saying things like that just makes me upset. What upsets me more is that I was already pretty uw when we first met, I weighed more than I currently do but still, he never really seen me at an actual healthy weight and only once I hit like >! bmi 13.5 !< he started to show concern , so idk…it feels like he only cares now because now I’m too skinny for his liking. Because what he calls my “healthy version” was like me at >! bmi 15 - 16 , like bffr ☠️ !< and he was obviously attracted to that…so as caring as it sounds , anytime he talks about how he just wants me to be healthy “again” and misses my “healthy version” or whatever I want to scream because he doesn’t even realize i was already uw before. Am I being too sensitive about this?