I'm sorry for the hurt that you feel. I've had friendships fizzle out, where I had maintained an interest longer than the other party. It's painful and can make you question your worthiness.

I think you need to move on. Your friend is not wanting the level of contact that you would like to have with her. When someone won't even reply to a text, they are sending a clear message. She's not investing anymore in this relationship. I think her way of exiting the relationship is kind of cruel. It makes me wonder how sincere her friendship ever was. She may be a person who moves in and out of friendships, as they serve some purpose in her life. Letting her know you're going through a period of need right now only makes you even less attractive to her. It's really only the most sincere friends who stick around when your "entire life is practically falling apart." I'm sorry if you have no one like that in your life. The emotional strain must be hard.

It's extra disappointing when someone you supported in the past doesn't reciprocate. Unfortunately, a lot of people will let you down like that. It's heart breaking. I think your best bet is to move on and seek out new friendships.

You might be able to mend things with this person to where you stay in very light contact with her. You helped that outcome by apologizing. But she is straight up not available for the kind of friendship you yearn for. I believe she will keep the connection superficial no matter what you do.