OH FELLOW BOREIANS I AM IN A SITUATION OF DIRE EXIGENCE!!!

So here's the DL, the skinny and I'm going to play it straightforward for you fine folks,
Picture the Fall of 2009. I was still an angry and remorseful sort after the breakup that left me shattered. The Summer that just swooned by had been an incredible three months where I met an exotic Godess, but who left back to her home country in September. So as soon as the trees started their ritual rusting, my elated personality started to break apart.
I was in a nighttime Creative Writing class at the time, and spent my lunch time at a cafe, drinking a large Chai tea and working on whatever project I had for that week. They made a great Chai and the terasse outside was quite comfortable, but I mostly enjoyed the banter with one particular Barista.
Tall and slender, red hair, a light dash or freckles and insanely deep brown eyes. She smiled constantly, which made me attracted to her even more since she was an exact contradiction to the person I had become. Solem and introverted.
Once the Rugby season was over, I went back to training dogs at the SPCA (during season, we train 3 nights a week and play every Saturday, my schedule didn't make it easy for me to take on any extra work). The first day back, as though I was living in some existential daydream, there she was! As it happened, she joined the program during the Summer.
We talked quite often when we saw each other, but I never took it anywhere because I didn't think it fair. I also found out she had a boyfriend, so I let it be. She left in the Winter and I never saw her again.
Until now,
Back from studying abroad, she has taken on a full time job as a receptionist at the SPCA. As my cousin who shares the same social circle has informed me, much to my delight, she is also very single.
But here I am, my life in such flux, that I dare not pursue her again, even given this second chance. I had been contemplating leaving the country, having never lived anywhere but Montreal. But now, as I'm getting ready to leave, I have a possible reason to stay.
Alas, I'm undecided and woefully terrified of any decision I need make.
spoiler (click to show/hide)
TLDR
Met a girl, she had a BF. She took of for a good while, now she's back and single but I'm not sure if I should pursue since I'm thinking about leaving the country.