It's a dance—move too close, and you get your toes stepped on. Keep people at arm's length, and you might lose contact entirely. Those of us who aren't exactly Fred Astaire trip over ourselves in relationship after relationship, in part because we pick up boundary-setting habits so early that most of us aren't even aware of how we move. Happily, it's never too soon—or too late—to become a better dancer. Here are four common dance errors (a shrink might call them dysfunctional boundary-setting patterns) that may sound as regrettably familiar to you as they do to me.