And what was Leia in regards to Han? She was a general and he was a subordinate. Or something along those lines. I would say a romance between them would be highly inappropriate. And she made her feelings very clear to Han to stop what he was doing and yet he "went in for the kill." His behavior was demonstrably worse, because he had her cornered and forced himself onto her. Anakin never sinks that low. When Padme tells Anakin that he's making her feel uncomfortable he does the exact opposite of Han. He maybe smiles in a sly way, but he doesn't force himself onto Padme. You bring up that Anakin tells Padme that he's been dreaming about her as an example of him persisting, but he doesn't tell her that in a sexual way, it's more of a congenial "I really missed you" kind of way. Also I'd like to point out that Padme told Anakin that "her caring for him shall remain" and that her "heart goes with him" in TPM, so there is precedence for Padme to feel certain emotions towards Anakin. You used Leia's past behavior towards Han to justify their encounter on the Falcon, but the difference is Anakin never crossed the line like Han did.