We've all done this at one time or another -  filled our minds with someone who isn't there most of the time, or perhaps isn't there at all - a crush, a loss, a fantasy, an ex partner, an unpleasant colleague and so on.  But if our minds keep replaying patterns of thought which are not serving us in a positive way then it is very difficult to be in the present moment and direct our energy in a way that encourages happiness and progression.  So what can we do about it?