Truth is, most missionaries feel this way. Introverts and extroverts alike eventually get sick of people coming and going from their lives. We tend to stick close to those who are more likely to be permanent and hold loosely those whom we know will board a plane to depart just as quickly as they did to arrive.
It doesn't have a lot to do with their lack of knowledge about their current surroundings, nor does it have anything to do with their short term agendas.
It is more likely that it has everything to do with the fact that as a missionary or any person who lives abroad, you have endured your share of great relationships who have been pulled away from you simply by the divide of an ocean... or a mountain, or even the scarcity of transport from one place to another.
We meet someone who we have a lot in common with. It could be geography, passion, language, list of movies, common holidays even. And then just as you think you've made a new best friend, their path branches off to a different set of adventures from yours, and let's face it: out of sight, out of mind.
