I did a terrible job of ending the friendship. At first, I would try to get back at her by doing the same things she was doing to me (we were very young at this time) I was hoping she would get the hint. Eventually, a few years later, everything came to a head after she broke up with this boyfriend that I couldn't stand (he was nasty to me, she let him be this way) and I told her how I didn't think she was being a good friend to me..she insisted she didn't know she was being a bad friend and promised to make more of an effort. Fast forward a few years, she never did change, and I just stopped answering her calls, I was completely done. My advice? Give this friend specific examples of what they do to you, why it hurts, and how doing these things are ruining your friendship. Honestly, I'll always regret not being very blunt about exactly what she was doing and why it was messed up, but I was young at the time and let it drag on for way too long.. it just became this toxic, messy relationship that should have never lasted as long as it did.