<human>: Can you condense the text into three sentences or less?

This girl was a really good friend of mine to the point where we acted like we were together but never put a title on it, this time last for about six months, but I have known her since January of this year. In a short time she ran away from what we had and is now dating someone else. See now I know the most logical thing would be to turn around and not speak to her, but I know something about her that is in a way causing problems with the way she handles her relationships and justifies why is ran aways from me. Now I am stuck in between running away from here and becoming someone else who leaves her life, or stay and try and help her while ignoring the past.
<bot>: a girl that I was more than just friends with hurt me but still claims that I am the only person who genuinely cares about her. Should I stay or should I go?