Replying to what to do about a totally un-shibby buddy

So I've been 'hanging out' with this girl for awhile. We werent really a couple, but she was my girlfriend, if that makes any sense. This girl is pretty hot (probably hotter than I deserve) and my buddy became interested in her after I introduced them. I was taking things really slow with her because she's never had a boyfriend, etc. and so I'd never made a move, and neither had she. I was fine with that because she's really cool and fun to hang out with and it was going to happen eventually. I had had a 'heart to heart' type thing with my buddy like three nights ago and he knew how I felt and all that, but he took her out to dinner anyway, and now they're a couple because she's moving back to Australia in a couple months and he's moving back to Australia in a month. So my question is this: what should I do? I've never been in this situation before. I dont really dislike the guy; she is hot and I would have at least thought about doing the same thing. The difference is that I would have stuck to thinking, and not actually doing. I'm not broken up at all about losing the girl (why would I be?), but I'm pretty pissed at my buddy because, well, I saw her first. I'm not going to hold a grudge (for very long) but I was wondering if I should do anything about it or just let it slide. Am I in the right or wrong here?
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no,my parents didnt go to college, my dad has a grade 9 education and my mom is a stupid slut -lateralis

'I don't like people who take drugs... Customs men for example.'