Which chapter contains the story of his ex coz I can't remember shit 😭😭😭

Afair (I really don't trust my memory ) there's no detailed explanation about Garam's ex. Just some recollections of Garam of him betrayed by his ex to explain his actions why he prefers being fvck buddy than have a serious relationship with Jaehyuk before. Maybe it'll be explained in this arc on how did that scum betrayed Garam. (๑•ㅂ•)و

Which chapter did he have recollections?
(￣∇￣")