Alexandra Levit quotes
You never know when a new job isn't going to pan out, or circumstances change, and you'll want to return to your previous company. I myself have done this. While being a hothead about leaving a job may seem satisfying at the time, it's just not very likely to serve you well in the long-run.
Alexandra Levit
Try to keep your mouth shut until you have a job offer, especially if your move is not entirely certain. There are only a few cases in which I think it would be appropriate to tell your boss what's going on. For example, if your spouse is being forced to relocate, obviously you are going to go, and if you have a good relationship with your boss, then it might take some stress off of you to tell the truth. The general rule, though, is not to give your employer more power over your destiny than you have yourself.
Alexandra Levit