well, as far as i recall, none of my characters committed to anything with regards to goro or hanako, and yes i helped takemura with the parade & setting up the meeting with hanako, i still made it clear i wasn't sold on going to saka at every point along the path, even after hearing out hanako, actually i was even more turned off of arasaka at that point.
hanako's plan was all kinds of wrong (imho), the board already knew yuri was the killer but didn't care, and bringing in a thief to testify is supposed to change that land scape, hanako already admitted no one important cared at all...
now, as long as you don't lead on goro, i can't honestly see how you're betraying him. however, we are all individuals who can't see eye to eye on everything. now, before you go on about honor and duty, i had a classical education in ninpo (note i still use the term as it's what ninjutsu was called originally, even though the meaning has changed in modern times), i spent 10 years learning in the traditional manner, eating honor, duty, and religion with my ongoing martial studies. second-degree blackbelt by the way (had to bowout do to injuries), so i have a few ideas about honor, and it's application.