Padmé wants him to stay forever, and it hurts to know that he can't. She knows it, because he needs to get back to whatever life he's leading that allows him to look after her children, but still she can't help but wish they could have more time together now. Time to remember when things were better and the days weren't so hard to get through.

But he does have to leave eventually, if only so he can come back again soon, and perhaps... Perhaps he would have news of her children that he could share. Some observation of how they're growing, what their first words are-- anything to help her know they're really out there, alive and well.