Basically alot of miscommunication, both are bad partners to each other. The continuous "I'm not gay" etc keeps happening. A lot of cheating, they both cheat on each other, especially the ML cz he purposely let MC witness and watch him get fucked by his ex multiple times.
Any unnecessary scenes and miscommunication you've ever come across or can't think of? All happen in the novel

Yall, the anime is different than the novel, if you want to keep your sanity and good memories of this story, stay w the anime.
I've read the novel since idk 2012? Absolutely horrible, sooo disappointed by it. It's very problematic and frustrating