Yep, there was a subplot where Padme and Obi-Wan had grown increasingly closer throughout the movie and Palpatine had convinced Anakin that they were falling for each other behind his back.
There was also tension between Padme and Anakin as she was very influencial in founding the rebellion against Palpatine.
As Anakin got more paranoid, he drove Padme further and further away from himself and toward Obi-Wan. Sort of a self fufilling prophecy, not unlike her death.
That's why Anakin flips out with the whole:
"Liar!" "You brought him here to kill me!" "You turned her against me!" "You will not take her from me!"
That whole series of scenes is something I really hope makes the dvd (and it probably will judging from EP II's dvd).