You were taken by WCKD because you stopped some guards from getting to Newt, Thomas, Frypan, Brenda and Sonja. You bought them enough time to run away.

You are in the WCKD lab and Teresa is standing next to you. She takes blood tests from you and makes you forget your memories.

The group plans to free you.

You are the strongest project and someone has to watch over you every second, otherwise you would break out.