Trigger script does not work.

I cant get my script to work right..... when the player go out of the Boxcollider the object Girl will destroy!?!?

 #pragma strict
 
 var flame : GameObject;
 
 function Start () {
 
 flame.SetActive(false);
 
 }
 
 function OnTriggerEnter () { flame.SetActive (true); }
 
 function OnTriggerExit () { flame.SetActive(false);
 Destroy(GameObject.FindWithTag("Girl"));
 }