It's also possible he thought about having her cloned, but really didn't want her to see him as a Sith and reject him again. If the flash-memory had included total, mindless devotion to him, she would only be Padme in appearance, and he might be certain that she'd reject him if she had any autonomy. Better for her memory to be pure, better to blame that "betrayal" only on Obi-Wan.
...Why have I thought so much about that. *sigh*
There's also a comic where Luke comes across a projection of Maul, and it turns out an old Zabrak is keeping his brain in a tank. Assuming these are both canon, do you suppose tank-Maul is this clone or the original? Or new?