The knowledge will horrify him, but it will also serve to strengthen his resolve to prevent the past from repeating itself. To keep them from suffering the same fate. Surely they weren't reborn just to do that all over again. Surely they're meant for something different this time.

"Yes," the prince answers. "I remember your tears and then— Then there was nothing. Not until I was reborn in this life."

And even then, his current incarnation was missing his childhood memories. Whoever that child was prior to that car accident, it's still lost to him.