This article raises an issue that terrifies me; over-reliance on one's wife for friendship. I love my wife and I do consider her my best friend, which is wonderful...but now that I no longer live in the same city as my closest friends, I don't have any really strong local bonds other than with her. She's planning a trip out of town in a few weeks, and I've already started figuring out what I'll do: maybe go on a bike ride, play some video games, clean our apartment, go see a movie, order takeout, etc. None of those plans involve friends. Probably not a good sign. =/
It's not exactly difficult to make loose friends or fun acquaintances, but maintaining and strengthening those into deep, close friendships feels nearly impossible.