I am sorry to hear about your relationship and it must be really hard. However, I think you should stay and give it a go. I am a great believer what is ment to be. You must be ment to be in Adelaide or you wouldn't have got the visa's. When they have a get together from P.I.A go and get to know as many people as you can. When you need a friend post on here it always helps.
Keep your chin up something will happen to help you make your mind up. Take care Janine