2d Rigidbody how to check if Player is moving towards the mouse

Hey everyone,

Sorry if I'm asking a dumb question here, I'm making a top-down shooter in 2D, and I made a really messy code to control player movement. Now I ran into an issue that I'm trying to resolve and I would appreciate any help. What I need help with is to detect if the player is moving towards or opposite of the mouse direction. Since my script is always rotating the player towards the mouse position, I need something to help me figure out if the player is moving in the opposite direction that he is facing.

Any help would be greatly appreciated. Here's the messy code:

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
   
  public class PlayerMovement : MonoBehaviour
  {
      [SerializeField] float moveSpeed = 15f;
      [SerializeField] Camera cam;
   
      private Rigidbody2D rb;
      bool isRunning = false;
   
      Animator anim;
   
      Vector2 movement;
      Vector2 mousePos;
      Vector2 movePos;
   
      void Awake() {
          rb = GetComponent<Rigidbody2D>();  
          anim = GetComponent<Animator>();
      }
   
   
      void Update()
      {
   
          movement.x = Input.GetAxisRaw("Horizontal");
          movement.y = Input.GetAxisRaw("Vertical");
   
   
          mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
   
          if (Input.GetKey(KeyCode.LeftShift))
          {
              isRunning = true;
          } else
          {
              isRunning = false;
          }
   
          SetAnimationState();
          handleRunningState();
      }
   
     void FixedUpdate() {
   
          movePos = rb.position + movement.normalized * moveSpeed * Time.fixedDeltaTime;
          rb.MovePosition(movePos);
          anim.SetBool("isWalking", true);
   
         
          Vector2 lookDir = mousePos - rb.position;
   
          Debug.Log("Look dir is: " + lookDir);
          Debug.Log("Rb pos is: " + rb.position);
   
          float angle = Mathf.Atan2(lookDir.y, lookDir.x) * Mathf.Rad2Deg - 90f;
   
          rb.rotation = angle;  
      }
   
      void SetAnimationState()
      {
          if (movement.x == 0 && movement.y == 0)
          {
            anim.SetBool("isWalking", false);
            anim.SetBool("isRunning", false);
            isRunning = false;
          }
      }
   
      void handleRunningState()
      {
           if (isRunning == true)
          {
              anim.SetBool("isRunning", true);
              moveSpeed = 30f;
          } else
          {
              anim.SetBool("isRunning", false);
              moveSpeed = 15f;
          }
      }
  }