@Axkmint That's not what a crazy ex means. A crazy ex is someone who bothers you months etc after a break up.
People have feelings. Guwon created this situation by ending a ltr in the worst possible manner. Personally, I think it's obvious that he cheated but that's hardly the issue.
You don't treat people like dirt and then expect them to disappear. Did Noa make me feel comfy? Not exactly but I'm glad she's dragging and embarrassing a guy who cares more about respectability than the feelings of someone who he was supposedly in love with for years.
Personally, I think the new girl got a nice warning too but she probably will ignore it.
This has nothing to do with gender 🙄
Breaking up at any point of a relationship is fine. Trying to end a 7 year relationship the same way you'd break up with the person you went to 1 dance with in middle school... Adults typically need some care after they've invested their lives into someone for years.