i’m i an asshole?

my best friend how i’ve known for years knows about my eating disorder. we had a friend who i dropped partially due to the fact she would trigger my anorexia and purging so badly i relapsed in the school bathroom twice. the best friend has recently said some things that set off that trigger. things the ex-best friend would say. “i’m fat” “this is so much food” “i look obese” etc. i know it feels so self centered but she knows it’s a trigger. on black friday, we had some food and on our way out of the mall she repeatedly told me “i feel fat, i feel fat, i feel fat” and i told her “shut up i don’t care” and i didn’t even register i had said that. it just came out like word vomit (no pun intended). then she told me “oh so you hate me” as a joke but i mean it. i don’t care if you feel fat. i don’t care if you think you look obese. and she never will comfort me about my ed even if i ask to vent or talk about it. she will just be like “yeah☹️☹️”…? she’s the one who always vents to me out of nowhere. i was playing Minecraft with my friend while she was texting me about something going on, full paragraphs out of nowhere and i was listening to her not some shitty “i’m sorry”. the way my ex-friend was more understanding about my triggers than hers BAFFLES me. what’s your opinions?