He told her he'd think about it.
Think about he did. Even tossed a coin a few times. It wasn't an easy decision to go to another galaxy, to a city that had only existed in myth until now. Yet here he was, in the SGC, getting ready to go. He was still wondering why he was going. Then he heard her voice behind him as she rushed past him to the ramp leading to the gate to make the final speech. He smiled. Now he knew.
He was only going because she had asked him to come with her.