Character facing wrong direction when moving vertically

Hello, I'm new to this, and I was wondering if you could give me some help.

I'm making a game with RPG like movement, where the character moves up, down, right and left. However, when it moves up or down I just want the character to face left or right, I don't have an animation for up or down.

The problem is that my character just tends to face right every time when it ONLY walks vertically, but I want it to face the direction that it was facing previously.

Here is a gif with an example, notice that when the character is primarily facing right then is fine, but when it walks facing left it switches between left and right and i just want it to face left: https://giphy.com/gifs/YKnPa7LqbuOD6ZcsDu

I'm sorry if I'm not explaining myself very well, please tell me if you don't understand what I want. Again, I'm very new at this.

Just in case, I'll put the code I use for movement. I primarily used the code from the Youtube channel Brackeys in RPG movement :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerController : MonoBehaviour
 {
     public float moveSpeed = 2f;
 
     public Rigidbody2D rb;
     public Animator animator;
 
     Vector2 movement;
 
     //Input
     void Update()
     {
         movement.x = Input.GetAxisRaw("Horizontal");
         movement.y = Input.GetAxisRaw("Vertical");
         
         animator.SetFloat("Horizontal", movement.x);
         animator.SetFloat("Vertical", movement.y);
         animator.SetFloat("Speed", movement.sqrMagnitude);
 
         if(Input.GetAxisRaw("Horizontal") == 1 || Input.GetAxisRaw("Horizontal") == -1){
             animator.SetFloat("lastHorizontal", Input.GetAxisRaw("Horizontal"));
        }
 
     }
 
     //Movement
     void FixedUpdate(){
         rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
     }
 }