Using raycast to detect line drawn with mouse

Hey,

I got this 2D project and as of right now, every time I click gameobject A, a line is instantiated and drawn, starting from A and ending at the current mouse position.

Now I want to snap the end of the line to gameobject B when I get (close) to it and leave it there when removing my finger/mouse.

For this I am currently trying out raycasting in the OnMouseEnter() method of gameobject B.

In pseudocode I would like something like this:

 OnMouseEnter() {
 
     if(line is at the position of the mouse) {
         Output "Line detected";
         Do stuff (e.g set gameobject B as destination in line object)
     }
 }

But currently my code looks like this:

     void OnMouseEnter() {
 
         // Contains the logic for creating lines
 
         Debug.Log("The raycast just hit " + Raycast ().name);
 
     }
 
     GameObject Raycast ()
     {
         Vector2 worldPoint = Camera.main.ScreenToWorldPoint (Input.mousePosition);
         RaycastHit2D hit = Physics2D.Raycast (worldPoint, Vector2.zero);
         if (hit.collider != null) {
             Debug.Log (hit.collider.name);
             return hit.collider.gameObject;
         }
         return null;
     }

This does detect the object beneath the mouse quite well, except for the line. When drawing the line and going to gameobject B, the output is just the name of gameobject B and not the line. And even after letting go of the line and just hovering/clicking the line, it does not seem to be recognized by the raycast. The line does have an EdgeCollider2D component, is there anything else missing?

So I would love to know how to fix this or if there's any better way.