Hi ranger74,
I just read your story and I just hope you can remain friendly with her during the last weeks with you in Oz.
She has done what so many other women have done, which is not to say that other Filipinas are not faithful, it seems most Filipinas really value being faithful - both parties.
She should not have been sleeping around when you were sending money and you agreed to be a couple.
As others have said, cut her loose and put it down to experience.
Best of luck.