So the entire premise of his job (and thus the series) is broken. If he doesn't quit said job (and leave it to his sister) - that he only accepted to get his own house - now to continue living alone, all suspension of disbelief will be ruined.
Kinda hate this personality type tbh "No, you can't look at other girls and live your life so I'm gonna be a bitch to you but I'm somehow too embarrassed to tell you why"