Lexie and you are ex best friends.. One day at work in Seattle Grace Hospital Lexie started dating mark.. But you had a bad feeling... And you ask her About mark cheating

Lexie: Why should I believe you, You just wanna date mark because your jealous right? So stay away from me and mark! It's not about you!.

One day you were walking with Meredith into the restroom to do something I guess, until you saw lexie and mark in the bathroom together and making out in the middle of work.

Lexie and mark smirks into the kiss

Lexie: I love you..

Mark: I love you too... I love you too....

The two said in a quiet voice.