"I don't know either. And I don't think Aslan would have called me here. After all, I'm the ruling King of Narnia. Now they have no one," he paused. "I don't see him taking me from Narnia, right after I made the choice to stay in Narnia."
If this wasn't Aslan's doing he didn't know when or if he would ever get back to Narnia. He knew what he would've done if he had stayed in Narnia. But this wasn't Narnia. And yet, he still needed a queen. And at the moment, all he could think of wanting was Queen Lucy.