I wonder if if she was trying to use the breakup move as a tool to get him to show her affection and then it backfired on her. You hear of girls who do this out of desperation, threaten to breakup and hope it scares him so he comes back to you. Of course Han Eol didn't want to be with her to begin with so he's probably thinking "jackpot! now I don't have to be the mean guy and break up with her myself!".