Back when high school first started, I (17F) had this friend (16F) who I didn't really talk to before that really got me through a tough experience, and then I really thought we had formed a connection throughout that time until a few months ago. We didn't go to the same school and didn't visit that often in person, but we texted almost every day and always had these deep, thoughtful and emotional conversations.

This past year she's been replying a lot slower to my texts (from hours to multiple days... meanwhile she posts on social media and is clearly active) and then, in September... completely ghosted me in the middle of a simple conversation. Our friendship didn't end on a fight or disagreement, I don't think we've ever even disagreed on anything I can think of... I'm just so confused and honestly heartbroken why she stopped talking to me. I think about this almost everyday, but on some days it really hurts and damages how I feel about myself. I've always been super introverted, awkward, quiet and I've never really had luck with friendships. She knew this and I think that makes me feel even worse.

Lately, I've been exercising and eating much healthier in an attempt to help with my mental health and low self worth, but I'm not sure how to get rid of this specific, icky feeling towards this friend. A part of me wants to unfollow/soft block her on instagram (I already unfriended her on facebook but she doesn't use that), but I'm not sure if that would make things worse. Even seeing her name on social media gives me this ache in my chest and sometimes ruins my day (same with other ex-friends). I think something that scares me is that I might have classes with her in University and just that it's not unlikely I'll run into her sometime.

Sorry if this is a bit lengthy... any advice or input would be appreciated. I don't want to feel so ugly inside over this but it has been months.

EDIT: I think it's also worth mentioning that she has some personal problems herself and that our friendship didn't necessarily end on a bad note. I really don't know what she thinks of me but clearly I wasn't too important to her. I'm scared of making this relationship worse despite the fact that we don't even talk anymore