As much as Obi-Wan is swayed by her words, he gives a small shake of his head. "And what of the day after? When both of us are alone, back to the lives we've been living, wanting nothing more than to return to this moment? Because I can't stay, Padmé. I can't." His voice breaks with strain, wishing he could explain it better to her.

This is the closest he's come to telling her where he's living, why he has to return. He wants to be here for her, but he also has to leave for Luke, for her. She is putting him squarely between a rock and a hard place, and he can't even fault her for it.