GUIDANCE People you can talk to. People who cheer you up. That lover who talks dirty in bed. People you can tell your troubles to. These are the ones it is saddest to part with, and part we do. The more someone does for you, the more you will miss that friend or love. The more you do for someone, the more that person will miss you. The degree of good feeling may even equal the degree of bad feeling. And the degree of satisfaction you have with a current companion is affected by past companio...