You didn't know what it was but you didn't trust. No matter how many times she told you she remembered you and were supposedly friends. Something about her just rubbed you the wrong way. You didn't know how to explain it nor did anyone really understand where you were coming from. She tried to get you to remember, remember your friendship but nothing she did worked. When she realised that didn't work, she tried to be your friend again but again, you refused to get close to her.
"We were friends. I need you to remember."
"The thing is, I don't know if I want to remember."