I Have Friends Who Do Not Talk to Me Anymore

My best friend isn't my friend anymore, drinking, and her boyfriend is more important. She only wants anything to do with me when they break up for a day, or everyone ditchs her.
I done so much for her (like walking 45mins to a park by her house at 1am many times to just to hug her, and say everything will be okay, then walk straight back)
She never did any of that for me, but I still miss her the same. I wish we could go back to how it use to be when she was a real friend, but that's not possible at this point.