Am I in love with this girl ?

So, about 3-4 years ago I was on an international exchange trip for 5-6 months. I loved it, best experience in my life and I will go back. BUT I met this amazing girl on the the program, we placed in same city. She was from around the world, but we made the bet with what we had. And near the end of my program we got attached. We went on a trip with friends across the country the last few weeks I was there. We both finally told each other how we felt for each other ever since the first day we met as we both flew into country from different parts of the world. We grew so close, we were a perfect match, and I never say that! It was nice. But when I had to go home. I had to say bye to her. Ripped both our hearts out of our chests. Neither of us wanted to say bye cause we didn't know when we would ever see each other again. HARDEST THINNG IN MY LIFE. . ...3 years has passed now. I use to keep in contact with her. I'm more busy with my career, things are happening, I'm in a relationship here. But, every now and again I catch myself thinking. Thinking about this girl, whose half way round the world. Thinking what it could have been. I don't believe in fate. But with this girl it sure feels like fate is real. And the most torture is the memories we had. ...it's unfinished business I feel. I need to know if it could have happened. ..so I guess, my question is what do I do? Should I go take a flight over there, but if I do that I may never come bak here...