Event.button activating constantly?

When I am running, the code that follows, the code runs in a constant loop. I want it to, among other things, only run when the user clicks on the left mouse button. Here is the code:

 private void Update()
         {
             if(TilePainterEditor.e != null && 
                textures[folderIndex][fileIndex] != null && 
                toolSelected == 1 &&
                TilePainterEditor.e.button == 0) /* This is where I check if it's clicked, The rest of the code is unimportant*/
             {
                 GameObject g = new GameObject(textures[folderIndex][fileIndex].name);
                 g.AddComponent<SpriteRenderer>();
                 g.GetComponent<SpriteRenderer>().sprite = Sprite.Create(textures[folderIndex][fileIndex],
                                                                         new Rect(0, 0, textures[folderIndex][fileIndex].width, textures[folderIndex][fileIndex].height),
                                                                         Vector2.zero);
                 Vector3 mouseRPos = TilePainterEditor.Position;
                 Instantiate(g,new Vector3(mouseRPos.x,mouseRPos.y, zAxis), Quaternion.identity);
             }
         }

Also, I can't use Input.GetMouseButtonDown() because that doesn't run in the editor view.