would anyone mind spoiling me on the third timeline?

Kloff remembers the original timeline while aeroc does not. Kloff is also severely mentally disturbed in this timeline.

Emm in short, Kloff is a mess. He remembered the original timeline scenes, that's why he's absurdly super obsessive with Aeroc to the point of locking him up (〜￣△￣)〜 Meanwhile Aeroc don't remember the past life (original first timeline), so well pretty much being the victim but also dependent to Kloff's unstable mentality

so pretty much this timeline is the only one where they're somewhat stable