[Python] Why does my pygame class work at random intervals [closed]

I am trying to make a class for buttons that draws and checks if they are clicked and changes its color. The drawing part works but the click check works half the time. I don't know the reson. Here's a simplified version:

import pygame
win = pygame.display.set_mode((800,600))

run = True
bcol = "gray"

class button:

def __init__(self,x,y,s,c):
self.x = x
self.y = y
self.s = s
self.c = c

def click(self):
mouse = pygame.mouse.get_pos()


for ev in pygame.event.get():
if ev.type == pygame.MOUSEBUTTONDOWN:
if mouse[0]>=self.x and mouse[0] <= self.x + self.s and mouse[1]>=self.y and mouse[1]<=self.y+self.s:
self.c = "white"

else:
self.c = "gray"

return self.c

def draw(self):
pygame.draw.rect(win,(self.c),(self.x,self.y,self.s,self.s))

while run:
for ev in pygame.event.get():
if ev.type == pygame.QUIT:
run = False

b = button(200,200,200,bcol)

win.fill((70,70,70))

bcol=b.click()
b.draw()

pygame.display.flip()

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