I usually despise people who breaks up with their bf/gf when they like someone new but for...

Falling out of love is also possible but as long they properly communicate and not cheat on their partner. I think liking some one is normal giving them priority or show your affection is wrong when u are already in a relationship. Oppa is right she need to be careful around him when she knows how he feels about her. Buut you are right i so ship these two together. Her bf is creepy.