Partners in Crime

"I hate you, get out of my life." I screamed at her. How could she have done this to me. I hate her.
"I will get out of your life completely in a few months." She said to me.

That was the last conversation we had and I regret what I told her. I didn't know what she meant back then and I regret it. I can't live with myself after this.

Lisa is a normal sixteen year old high schooler with perfect parents and a perfect life, or everyone says so.
Eleanor is her best friend who is like the sister she never had, but, what is Eleanor hiding from Lisa? Why is she so distant?