Edit one element in Vector3 array

So I'm making a script where a character follows a line that is drawn through the linerenderer. To store the "waypoint" positions, I made a vector3 array. But the problem I'm having is, when I'm editing the values of the array in a for loop, instead of editing just the last element it's editing all of them.

Here's the code I'm having trouble with:

 public class lineDraw : MonoBehaviour {
     public LineRenderer lineRender;
     public Transform origin;
     int numberOfPoints;
     Vector3 mousePos;    
     public Vector3[] waypointPlace;
     // Use this for initialization
     void Start () {
 
     }
     
     // Update is called once per frame
     void Update () {
         waypointPlace = new Vector3[numberOfPoints];
 
         if(Input.GetKey(KeyCode.Mouse0)) {
             numberOfPoints++;
             lineRender.SetVertexCount(numberOfPoints);
             Vector3 mousePos = new Vector3(0,0,0);
             mousePos = Input.mousePosition;
             mousePos.z = 1.0f;
             Vector3 worldPos = Camera.main.ScreenToWorldPoint(mousePos);
             lineRender.SetPosition(numberOfPoints - 1, worldPos);
 
             //add mouseposition to array
             for (int i = 0; i < waypointPlace.Length; i++){
                 waypointPlace[i] = new Vector3 (mousePos.x,mousePos.y,mousePos.z);
             }
         }
         if(Input.GetKeyUp(KeyCode.Mouse0)) {
             lineRender.SetVertexCount(0);
             numberOfPoints = 0;
         }
     }
 }
 

In this picture you can see that all the elements have the same value, and I'm wondering what I'm doing wrong