[Python] Cannot close a dialog PyQt5

I have the following 2 classes. From UI_mainwindow I open a dialog as seen below. I want that dialog to close when I click on one of those 2 buttons (createProject_btn, openProject_btn). Though nothing seems to be working.

I know this kind of questions have been asked million times, and I'm sure there are duplicates, but my eyes are so new to the python, I cannot follow the patterns. Hence, any help is appreciated.

Note: the ui files are pretty simple, one button on UI_mainwindow to open the dialog, 2 buttons on the dialog to set a property inside and close the dialog.

Ui_mainWindow

import os

from .createOrOpenProjectDialog import CreateOrOpenProjectDialog
from qgis.PyQt import uic
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import (QDialog)

FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), 'ui', 'window.ui'))

class Ui_mainWindow(QtWidgets.QDialog, FORM_CLASS):
def __init__(self, parent=None):
"""Constructor."""
super(Ui_mainWindow, self).__init__(parent)
# Set up the user interface from Designer through FORM_CLASS.
self.setupUi(self)
self.connectSignalsSlots()

def connectSignalsSlots(self):
print("main.connectSignalsSlots 1")
self.pushButton1.clicked.connect(self.createProject)
print("main.connectSignalsSlots 2")

def createProject(self):
dialog = MyDialog(self)
print(dialog.exec())
dialog.showOutput()

class MyDialog(QDialog):
def __init__(self, parent=None):
super().__init__(parent)
# .dialog is just a handle - class property that we created here
self.dialog = CreateOrOpenProjectDialog(self)

def showOutput(self):
print("showOutput:")
print(self.dialog.clickedButton)


CreateOrOpenProjectDialog

import os

from qgis.PyQt import uic
from PyQt5.QtWidgets import (QDialog)

# This loads your .ui file so that PyQt can populate your plugin with the elements from Qt Designer
FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__), 'ui', 'dialog.ui'))

class CreateOrOpenProjectDialog(QDialog, FORM_CLASS):
def __init__(self, parent=None):
"""Constructor."""
super(CreateOrOpenProjectDialog, self).__init__(parent)
self.setupUi(parent)
self.connectSignalsSlots()

def connectSignalsSlots(self):
# todo: figure out if actions are better to use then direct events
# self.action_create_project.triggered.connect(self.createProject)
self.createProject_btn.clicked.connect(self.createProject)
self.openProject_btn.clicked.connect(self.openProject)

def createProject(self):
print("dialog.createProject")
self.clickedButton = "createProj"
self.accept()

def openProject(self):
print("dialog.openProject")
self.clickedButton = "openProj"
self.accept()

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