I feel so angry and upset?

My brother met a woman from Australia who came to England to visit her ancestral home and he fell in love with her right away! Almost so that they both lived together for a while until she had to return to Australia. A month had ped since she went home and he received amazing news that she was pregnant. He was so ecstatic that he was going to be a dad that decided to apply for a visa to enter Australia. They both wanted to get married as well as bring up the baby together so he could only apply for a 9 month marriage visa then he could reapply for a permanent visa once settled in his new life over there. He has only been there a week and his fiance has told him that she now wants nothing to do with him and doesn't love him anymore! The most soul destroying thing was that she told him a day after he landed in Brisbane. i have recently found out and I'm absolutely steaming with anger but also feel guilt as I was all for him going there. I have been crying myself to sleep and really feel like giving her a piece of my mind as he is the nicest guy anyone could ever meet and would do anything for anyone. Why does it always happen to the nicest people? Anyway, the reason I;m telling you all this is because I don't know what to do, what advice to give etc....Can anyone help me with this at all?