Ron sighed, how could he put into words just why it was a mistake?
"It wasn't you." He said softly, and held up his hand to stop her speaking before he was finished. "I didn't realize just how much of a mistake it was until I got with you, but the first time you kissed me I knew. I knew I should have waited and I shouldn't have slept with my first girlfriend just because I could, and she wanted to." He hesitated to say girlfriend, but that's what she was.