Long Distance relationship!?

Hey ladies! I am from Australia but came to the United States on holidays last year and met my current boyfriend whilst I was here. We dated for the 5 months I was here and a month or so when I went joke but broke up because it wasn't working out. I've now Coke back to the states and been back together with this guy for another 7 months however my visa expires in 5 months and I do plan on coming back here next year but I'm wondering what I should do about our relationship. We have talked about the future and want to be together and want to make it work, his even hinted at getting engaged within the next few years. Am I crazy to give up my home and life back home on the chance that we might be together!? I know he DEFINITELY wouldn't move to Australia...