How do you know that a friendship is real -- that it's built to last? The test is simple: See what happens when one person doesn't need the other for anything anymore. We all get something out of friendships: a person to hit up the bar with, a gym buddy, a shoulder to cry on when things go awry. But sometimes circumstances change in one's life that leaves them with less time for or interest in a given friendship: They move, get married, they have kids, and so forth. Unfortunately, many of my friendships have ceased to exist -- or become much more watered down -- as soon as the person got into a relationship. Some people seem to have trouble juggling their relationship with their friendships. It could be a sign of a possessive partner, or maybe the friend is so head over heels in love that they couldn't care less about their friends anymore. I've observed that people who abandon their friends for a relationship end up regretting it, especially if the re...