hey guys, thanks for the replies.
No, the 2 didn't know each other until I started dating my gf a few months ago. I can't actually keep the 2 apart. From what I see, its my friend who come up to her all the time. It really did come to me as a surprise the way my friend was treating her, as she's never been like that before. Well, I've never seen that darker side of her. And it really does hurt to see that.
The thing is, my gf is actually very sensitive. Even though she's been exposed to loads of harshness from my best friend, she still insists she's alright and deep inside i know she's really hurt. She hides her feelings most of the time and i really don't know how i can help her (or maybe she still feels insecure around me?)
On the other side, my Japanese friend (had a LONG word with her).....I am actually starting to feel that maybe she does like me you know, more than a friend. You guys are probably right. As I've never seen her behave like this. But really it still hurts to see my friend being rude, and my gf suffering the same time.
Damn, I'm just going to stick with my gf as much as I can now, even though i might regret in the future for not spending enough time with my best friend, i dont bloody care. i dont want to lose my gf.