They skipped explaining how the whole clan is suffering the effect of inbreeding, the MC thinking he was dying when he got sick is because of a compromised immune system do to said inbreeding. No idea why they left that part out.
Jolly gee, I can't see any reason at all someone would want to keep their ex and the stalker that's blackmailing them into a relationship from meeting each other. And Kibe isn't a friend at this point.