Friends don’t care

I don’t know if I’m being harsh, but I really feel like my closest friends have let me down in wake of my sister’s passing. One of them clearly found from another friend and she didn’t even text me. I called her to tell her and while she sat on the phone with me and assured me that I can call her again if I need to, she hasn’t reached out at all and I just don’t understand it.

I know I shouldn’t, but I look at the other members of my family and how all of their friends are being incredibly supportive. They’ve even reached out to me more than my own friends. It’s making me feel even more horrible about myself than I already do in my grief.

I know I’m only 18 and so my friends have largely never dealt with any significant loss of their own, but how self centred do you have to be to not even send a simple ‘hope ur ok’ message when u get the chance??

How do I reconcile with the fact that some of my closest friends haven’t been there for me during the worst thing I’ve ever had to go through?