Lot's of ? ? ?

I had just finished watching "Japanese Story" for the second time...i found it quite interesting actually despite the slow and not much conversation scenes in this movie...i found new messages behind some of the characters' small actions...now i can understand more about the movie and most importantly, the messages that the director trying to convey to the audience through this movie...

However, there's also something that makes me wonder...Tachibana loves Sandy despite they have some communication problems due to different country they come from...They terribly in love with each other but in spite of this, Tachibana still choose to return to his homeland and reunite with his wife and his kids...I'm quite certain that he did it out of his obligation to his family but is that mean there's no more love between he and his wife? or the love they share is just for the seek of their children-to provide them a peaceful and harmony environment to grow up?How does Tachibana's wife feel for him?does she feel the same way as her husband?If she still love him, how she would feel if she knows Tachibana chooses her but not Sandy just out of responsibility?Can she forgive him as love is something that we can't control?obligation always come with love but love does not always comes with obligation. If everyone in this world just follow their heart and not their brain to do everything, will this world be peaceful?

it's complicated...there're lots of questions in my mind but i just don't know how to list them all out here in order manner...they confuse me...when i ponder on them critically, i thought i have got the answer but when people ask me to express my opinion, i start to feel confusing again...ohhh!this is terrible...