Let it be.
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Bye.
'I think I'm in love with you I probably shouldn't and you are completely oblivious anyway wish you all the best be it under the Australian sun or Irish drizzle'.

Truth be told, my problem solved. You mean (almost) the world to me but you will never know.

Ok you did it. Doesn't matter anymore. XDDDD. Whatever he might think you will probably never see each other any more. Plus the fact that he's going back.
At least you won't spend the rest of your life wondering 'what if' (:

Such a relief omg.
STUDY STUDY STUDY I AM FEELING SO MICH LOVE FOR STUDYING NOW OMG.

Perhaps you are feeling a bit nervous/at a loss/sad atm... But it will pass! Just think of the fact that you won't see each other again doesn't that make the whole thing much better. No awkwardness. Aww.

No matter how terrible his languages become, you can deal with it. You made terrible rejections before and you know it's just the best for both of you XD
Omg I'm having this nervous/awkwardness/idkness :/

Ok he's ignoring me now which is fine. This is a utterly stupid yet efficient move from the very start. You might have embarrassed yourself but you will never have to wonder what if any more and can focus on studies. Even if he regards you badly hereon, you'd still be fine just avoid bumping into him.