Anyone know how to see if the player is moving backwards?

Heres my code for a paper mario style flip animation: using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class srRotate : MonoBehaviour
 {
     public SpriteRenderer SR;
 
     public Player target;
 
     public Animator flipAnim;
 
     private bool movingBackwards;
 
     // Update is called once per frame
     void Update()
     {
         if (!SR.flipX && target.moveDirection.x < 0)
         {
             SR.flipX = true;
 
             flipAnim.SetTrigger("Flip");
 
         }
         else if (SR.flipX && target.moveDirection.x > 0)
         {
             SR.flipX = false;
 
             flipAnim.SetTrigger("Flip");
 
         }
 
 
         if (!movingBackwards && target.moveDirection.y < 0)
         {
             movingBackwards = true;
 
             flipAnim.SetTrigger("Flip");
 
         }
         else if (movingBackwards && target.moveDirection.y > 0)
         {
             movingBackwards = false;
 
             flipAnim.SetTrigger("Flip");
 
         }
     }
 }