Seol Jihu and his Ex

Hello guys i read the manhwa and im hooked now i started reading the novel and also did some research about what the manhwa left out. I heard somwehre that Seol's ex betrayed him with another guy. But while skimming though the chapters of the novel i couldn't find the right passage. Can someone tell me the right chapters, because i don't want to re read the whole story. I want to re read the passages about his live in the real world and about that past. Or can someone tell me what happend. Would be very nice. Thank you guys in advance.