Relationships with Expiration Date

This is actually copied from the last "Sex and the City" episode. However, I guess most relationships, which start here are kind of relationships with expiration date. What is the probability of a long-term relationship for let's say consultants like me? I mean not with locals, but with something serious. I doubt whether it is high.

Actually, I do not believe that relationships with locals are serious and thus long-term oriented. Of course, there may be exemptions, but in general there is a generic problem of asymmetric informations which cannot be solved with the standard solution set. Therefore, I envy those, who enjoy their relationships which started abroad, continued on different continents and ended in one place.