friend problems

tw: self harm??
soo in my other post i talked ab this friend of mine and basicallyyy i kinda stopped seeing her but we still text. she told me she feels really miserable without me and she started self harming?? and of course i feel bad bc i really am her only friend so its hard on her but im not sure what to do. i just feel this constant responsibility to always be there for her to keep her sane, like i dont even feel like a friend but almost like her personal therapy machine that always has to be by her side. and she does understand that i have my limits especially due to my depression when we text and all but whenever we met irl she literally never even looked at me as another human being? or thats at least what it felt like, always thinking of her needs and wants and expecting me to do everything for her even the little things, it feels belittling. but once again when we text shes not like that. andd yeah like now that i stopped seeing her irl she keeps posting ab how bad she feels and keeps asking me when we can meet etc and i feel bad bc ik im a huge part of why she feels the way she does rn. but at the same time i shouldnt feel responsible for her own feelings and issues right? idk