I guess, it's life? Things don't always go the way you want. Ever heard of Deus Ex Machina? Like it or not, deal with it. You're depressed. So what? Deal with it. Quit whining, kiddo. Stand up on your own, make effort to build something new or to get a new job and start praying to God instead of just whining and staying depressed or lazing around in your safe zone!
To begin with, don't expect anything out of any human, ever! They have their own interests and you never know when they're gonna betray you anyway! So, you're always on your own, there's only God with you. The only other one you can trust that won't betray you is your enemy, since you know his intentions: to hurt you.
She didn't like you before. She seemed like she stopped liking you in school, so why should you trust her for liking you and supporting you now?
Edit: for those who want to grow up beautifully, the only way to grow up beautifully is to deal with it and move on, not to wallow in depression. Suck it up and learn from it. It may sound dumb for you millennials and kids these days who don't know what hardship is, but when the time comes, you'll understand. The pain will temper you and turn you into a tempered diamond, with greater value. If you lose to that pain, then to begin with, you had no value at all. So make that pain into good experience, something that you can learn from.
