My character won't stop crouching, they dont stop crouchin

My character won't stop crouching

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerMovment : MonoBehaviour {
 
     public CharacterController2D controller;
 
     public float runSpeed = 40f;
 
     float horizontalMove = 0f;
     bool jump = false;
     bool crouch = false;
     
 
     // Update is called once per frame
     void Update()
     {
         horizontalMove = Input.GetAxisRaw("Horizontal") * runSpeed;
 
         if (Input.GetButtonDown("Jump"))
       {
            jump = true;
       }
         if (Input.GetButtonDown("Crouch"))
         {
             crouch = true;
         } else if (Input.GetButtonUp("Crouch")) 
         {
             crouch = false; 
         }
 
       
     }
     void FixedUpdate ()
     {
         // Move Character
         controller.Move(horizontalMove * Time.fixedDeltaTime, crouch, jump);
         jump = false;
     }
     
 }