Teacher isn't exactly doing the wrong thing, entirely. The problem with her is why she's doing it. She's got a severe Savior Complex that is borderline Fetishistic. She might try a kidnapping at this point
In one of the panels, when he's a kid, you can see a girl next to him. Aside from that, this is a trope ridden mess so of course she'll be a sister lol
That aside, this garbage don't stink that bad so I'll probably keep reading just out of curiosity.
Everybody gonna judge the ex but watch her be a totally wholesome, if a bit risque, girl and she has a perfectly fair and reasonable reason for just up and disappearing
....Naaaaah I don't think this author has the balls, safe option for free drama incoming