Moving a bullet towards mouse position in pygame

Question

this might be a duplicate of a question but i don't know what to search to find the solution of this problem i want the bullet fired to perfectly coincide with mouse cursor at the time of firing here is my code

import pygame
import math

pygame.init()
window=pygame.display.set_mode((500,500))
clock=pygame.time.Clock()

class Bullet(pygame.sprite.Sprite):
    def __init__(self,pos):
        super().__init__()
        self.pos=pos
        self.image=pygame.surface.Surface((5,5))
        self.image.fill("white")
        self.rect=self.image.get_rect(center=pos)
        self.mx,self.my=pygame.mouse.get_pos()
        self.move()
    def move(self):
        self.dir=(self.mx-self.pos[0],self.my-self.pos[1])
        length=math.hypot(*(self.dir))
        self.x_dir=self.dir[0]/length
        self.y_dir=self.dir[1]/length
    def update(self):
        self.rect.x+=self.x_dir*2
        self.rect.y+=self.y_dir*2


bullets=pygame.sprite.Group()


while True:
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            pygame.quit()
        if event.type==pygame.MOUSEBUTTONDOWN:
            bullets.add(Bullet((250,250)))
    bullets.draw(window)
    bullets.update()
    pygame.display.flip()
    clock.tick(60)

i followed what is said here

https://stackoverflow.com/a/59980344

am i missing something because whenever i click on the screen the bullets move in general direction of mouse but doesn't coincide with the mouse pointer itself or can i not use the same concept for sprites?

[![see the bullet is not precise most of the time it just goes from the side of the cursor][1]][1]

and I followed the solution from the question that is said to be the duplicate https://i.stack.imgur.com/AOiIt.gif