Rotation of player occurs continuously when on the left side of the screen

This code:

             using UnityEngine;
     using System.Collections;
     
     public class PlayerRotation : MonoBehaviour {
     
         public float Sensitivity;
     
         private Vector3 MousePos;
         private Vector3 WorldPos;
     
         private float MouseXSet;
     
         void Start () {
             MousePos = Input.mousePosition;
             MouseXSet = 0;
         }
     
         void Update () {
             MousePos = Input.mousePosition;
     
             MousePos = Camera.main.WorldToScreenPoint (MousePos);
     
             if (MousePos.x > MouseXSet)
             {
                 rigidbody.transform.Rotate (new Vector3 (0, 1, 0) * Sensitivity * Time.deltaTime);
                 MouseXSet = Input.mousePosition.x;
             }
             if (MousePos.x < MouseXSet)
             {
                 rigidbody.transform.Rotate (new Vector3 (0, -1, 0) * Sensitivity * Time.deltaTime);
                 MouseXSet = Input.mousePosition.x;
             }
         }
     }