To have the cake and eat it too

I have been in a relationship for about 2,5 years now. It was an easy going relationship at first and we had our problems and to be honest I never thought it would really last. But it was nice, so we kept going. Last summer we decided to break up. I then decided to go abroad for a year, but the time of departure wasn't until 3 months later so we decided to keep living together and pretend nothing had happened until then. Strangely, after our breakup, we got so much closer and finally I was the one that wanted to keep it going. He didn't. Then I went abroad as planned but we stayed in touch almost every day like we always have. After a few weeks I came back home and we met again and he said that he had realized that he wanted to spend the rest of his life with me. My problem now is that I think we could have a very happy life together and I don't really want to lose him. My other problem is that I still want to live my own life while I'm abroad for this year, and I have met a man there, with whom I have no future (he's from a country way to far away) but I'm so infatuated and I really want to have this experience. Then I'll come back home and everything will be like normal. So, I obviously have a choice to make. Should I suffer in a long-distance relationship for months and miss the adventure I could have with my foreign love, or should I risk losing my boyfriend and tell him that I have to have this year for myself and that we will see about things when I get back? Another question: Does it say something about my feelings for my boyfriend that I also have feelings for another man?