Am I being too sensitive?

We have dealt with infidelity in the past and I still have insecurities related to that due to comparing myself to them. I’ve been in a depressive state and haven’t been eating properly, which has caused me to lose some firmness in my boobs. Before all of this and before him and I got together (2016), I never questioned whether my boobs were big enough and always got compliments on them. I felt fairly confident about them. But last week, I made the comment that I needed to started eating some more to gain weight and he asked why. I said so I can try to get more fat in my boobs. He pretty much jumped out of bed all excited and asked if I wanted him to go get me some food. I felt really hurt. He had never acted that way before and had always said I didn’t need to change anything about them, but how he acted made me feel like he wished they were bigger or more firm. I’m already having trouble with my insecurities and it felt like he just made me feel even worse.

If he would’ve asked to get me food in a normal tone, then I would’ve thought he was just trying to get me to eat bc I need to. But his reaction is what hurt. He said it was a joke, but it happened a week ago and has still been replaying in my mind that maybe I don’t look how he would like and it furthered my insecurities. Im stuck on whether I’m just overthinking this. Am I being too sensitive?