Why can’t I cry? *sorry for the long post

I’ve always been a very emotion person and I tend to cry at things that feel important to me. I recently got in a fight with my best friend the fight has kind of been building for awhile but basically it started before our school dance at a restaurant when I told one of our friends that she should have the last slice of pizza because she’s so skinny and she should be eating the most. I want to make it clear I had no ill will in that comment and in fact I have been struggling with an eating disorder since middle school I frequently fasted had just started doing it again that day to “fit into my dress” I immediately realized it was a bad comment and apologized and told her she’s beautiful as she is when my friend told me I shouldn’t have said that. I thought we had moved on from it when my friend texted me after the dance (mind you I hadn’t seen her most of the dance and in fact she had completely abandoned me and fellow wall flower friend who tends to have difficulty with social interactions and whom my best friend had me personally convince to go to the dance to hang out with her other friends) and she texted “I know you didn’t mean anything by it but Veronica cried the entire night cause you called her a twig so you need to apologize” I ended up apologizing to Veronica again but at this point I completely went off on my best friend and told her if anyone should be apologizing it’s her for leaving us completely alone at the dance she then told me it wasn’t ok that I can’t just body shame Veronica and told me I have no filter. I’m now sitting by here wondering why I usually cry at everything but somehow not at this. In retrospect I may have overreacted but at that moment all I could think is that this girl whom I called my best friend got so upset about my comment and demanded I apologize but I was always left crying and alone whenever I texted her about the latest fat shaming joke from my uncle or dieting advice from my mom I had just received at home. I felt so misunderstood by the person who I was so close to like she never really heard anything I had to say and I wondered how she could think so badly of me that she honestly believed I would say it with any bad intent. Why can’t I cry about it? Was I in the wrong here?