She knew he was trying to cheer her up; shine a little light into the very dark space Rose hid herself in. However, hearing him basically say she should move on and learn to live with Bryn, hurt so much. Of course, it had always been in the realm of possibilities, but she did everything she could to keep the thought away. Please Merlin, don't let that happen. Make me well enough that Bryn remembers why he fell in love with me...
"You were not stupid; you were in love," Rose said. "Love can make you stronger than you thought possible, but it can also break you into pieces so small it would take years to repair."