We don't know why he did that but we know why he did a 180. She wished for her boyfriend to be more assertive, more egoist, more like the ML in the novels she read ... (More like her her). Because the way he was acting, to her it meant he didn't care enough. At first the story told us the bf and ex switched personalities, so rn the ex is acting like a pushover like the bf was ... But idk it also feels like the story is hinting that it was always in them but they were suppressing it, now that part of them is taking control. If I have to guess, I'd say that for the first time he actually felt something when it was all games for him and run away cause he's a coward.
I meant (more like her EX)
Uh did we get any answers as to why the ex suddenly broke up with her and mistreated her, and why he's done a full 180 now?