Someone may have already said this, but... Obviously Padme ALREADY loved Anakin when he made his confession to her on Tatooine. Falling in love doesn't have to take a certain amount of time, and it doesn't have to happen for clear and concrete reasons. She fell "truly, deeply, yadda yadda" in love with him on Naboo. (or perhaps even before that, who knows? Is SW "too realistic" for Love at First Sight, which is something that actually happens in the real world anyway?!) So, when he made his confession on Tatooine, you want her to just suddenly stop loving him out of utter self-righteous indignation. No thanks.