Not really. He was doing that from the beginning. He was sleeping with Jo even though TJ was on the side. It’s not until Ian went back to TJ that everyone basically started shaming him like he’s committing some kind of crime.
Bro you don't know anything about the fanwars. Two sex scenes of Jo and Ian were heavily got hated by the majority of fans. The majority of the fans in this fandom are the stans. The author had to physically make a post about the hate regarding those sex scenes between Ian and Jo. It's the same case for TJ stans and Jo stans. They don't like when Ian goes back and forth between these two men.
*TJ stans
Hm, must be about the website I was reading it from. It’s sad that it gets to that point. The story becomes under-appreciated because of it.
The same goes for TJ stans lol. Have jo fuck Ian again they'd be slut shaming Ian too. People only care about the two male leads not Ian lol. As a Jo stans at least I have never once speak anything against Ian or TJ.