What do you think?

So I met this guy a three weeks ago. he seems pretty nice.
he expressed interest in me and wanted to know if I was single. He is also single. He invited me to know his home also and where he works. he would call me all the time. and yes I slept with him. for me it was very quick and since I never had sex for say 7 years, hell I never really mind.
Funny enough i was expecting him to stop calling me after sex. however he never did. Very sweet guy it seems. But this one thing puzzled me. He seems to be planning on going to work in Canada. that I dont mind, but I would not want to continue to invest valuable time in the relationship knowing that he might be gone in a year or so. I dont wanna be selfish as I believe that persons should aspire to get what they want, but at the same time I want to be cautious. What do you think I should do?
What do you think?
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