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I believe that opposites attract, and that two introverts don't work well. As an introvert, I have found that I also have a tendency to attract extroverts, but ones who are not *overly* extroverted (as I do not consider myself *overly* introverted). All of my significant friendships have followed this pattern as well. I think it's true that we look for what we lack in other people.
On the other hand, there *must* be some common ground for any relationship to work. What I've observed in my own relationships and others is that the common ground aspects are usually things like morals/values, background, religion (sometimes), and interests. Having a different personality from your S.O., and even good friends, is often a plus.
Ironically, being around a extroverted S.O. made me more talkative and him more quiet, the longer we stayed together. I would not have come to life, so to speak, had I not met him. I hope the LW realizes that being around people who are *too much* like us is not necessarily good, because it's hard to change and grow as a person when we are literally surrounded by ourselves. I guess it depends on where she is in life.