Giving him an incredulous look as he took entirely the wrong thing from what she had just told him, Hermione stared at Ron, jabbing a finger in his direction to emphasise her words as she spoke. "Don't you swear at me. You obviously don't even have the slightest clue of what you're talking about. I was thinking about you, all I damn well do is think about you, and I thought you would understand."
Apparently not. She hadn't meant to ruin any of his plans, and if he hadn't thrown such a fit she might have suggested that they go out that night instead. Hermione hadn't been lying when she said that she had been thinking about him; that was why she had taken so long to decide, and consequently tell Ron that she was going to France. But according to him she never considered him at all.
As he walked out of the flat and slammed the door behind him, she followed him out before he could get too far, not particularly wanting to bring this out in public, but if that's the way it was going to go then so be it.