2 red flags: Will this person bring out the worst in me? Does she have any idea of her self-worth?

I have a pretty spot on judge of character so I can tell the manipulative bitches from the good people. My issue is I'm highly empathetic and put everyone's needs above my own. Not a good combination to have in someone who goes above and beyond for their friends.

My best friend from high school used to call some of my friends the "All Star's" because they were people that were so different from me it was unimaginable to her how we were friends. They usually were in a bad place in their life because they made some mistakes, not because they were bad people.

Well one of those people was a close friend of mine and she had been spiraling into partying and experimenting with prescription pills (we were 16 years old) thanks to her dads second divorce from her stepmom and her actual mother being a batshit crazy bitch (story for another time). I spent so much time worrying about her, sneaking out of my house to go find her, being her caretaker, and swearing not to tell anyone about anything that i began not sleeping. I remember the day I finally had to draw the line. She texted me to meet her in the bathroom at school and when I got there she was passed out against the bathroom stall on the toilet after taking a bunch of Xanax. She was barely there, a shell of the person I used to know, slurring her words and leaning on the fucking disgusting trash for sanitary napkins. I told her that I loved her but I couldn't be her friend anymore and lose sleep over someone who was so great who was trying to throw their life away.

So while I'm accepting of most people, I don't allow people who have no life's purpose into my life. I just can't.