fgm24/Assets/Scripts/Player/SpriteMovementFlipper.cs

using UnityEngine;

public class SpriteMovementFlipper : MonoBehaviour
{
    [SerializeField] private bool invert = false;

    SpriteRenderer sp;

    Vector3 prevPos;

    void Start()
    {
        sp = GetComponentInChildren<SpriteRenderer>();
    }

    private void Update()
    {
        if ((transform.position - prevPos).x > 0.1f)
        {
            sp.flipX = invert;
        }
        else if ((transform.position - prevPos).x < -0.1f)
        {
            sp.flipX = !invert;
        }

        prevPos = transform.position;
    }
}