I had to leave before all those great times we had turned to shit. In my world good things don't last. And great things, things like what we had, sure as hell don't. I was saving us both from a lot of heartache down the road.
Knowing she was a poor liar under pressure kept him from telling her the truth. He remembered far too many occasions as kids when they had formulated a story to stay out of trouble with their parents and she had blown it within seconds.