When it was revealed he was dating Nadiya (or at least rumoured) Kai used to have so many comments under his instagram slating him and saying how dare he do this to AJ etc. Whether that was the entire fanbase or just one person it doesn’t really matter, seeing that combined with abuse towards his new girlfriend probably pissed him off. I know there was some crossovers between people on that thread and comments towards them both on social media as well which was ridiculous. It was harmless and a bit of fun for people to be shipping them throughout the series (pretty sure this is when they both played up to it, don’t remember seeing anything after the show though that would imply they were together) but this should have ended as soon as he went public with Nadiya, yet it still continued for months and even now people are still going on about it.