Selecting and unselecting objects with raycast

I made this in order to select objects :

var ray : Ray = camera.main.ScreenPointToRay (Input.mousePosition);

var hit : RaycastHit;

//Debug.DrawRay (ray.origin, ray.direction * 100, Color.yellow);

if (Physics.Raycast (ray.origin, ray.direction, hit, 100))

{

     if(hit.collider.tag == "Object")
     {
         print ("Here is an object!");
     }


         var object : GameObject = hit.collider.gameObject;
     
         var myAI1 : MyAI1 = object.GetComponent(MyAI1);
         
         //we change the color
         myAI1.ChangeColor();
         
   

}

It works fine, and i know when the mouse goes over the object, but how could I do to know when the object is being unselected, when the mouse is leaving it?

thank you for all the help!