There are times when people intentionally change jobs.  It may be that a person finds an opportunity for better working conditions, faster advancement, or more money.  There is a right and wrong way to do everything, including changing jobs.

Don’t burn your bridge behind you.  You may know that you’re never going back, but why not leave in such a way that your boss would really like to have you back?  You never know, when somewhere down the line, leaving a job in good standing will pay big dividends for you.  Some prospective future employer may make a decision about you based on what he can gather from your former employers.

Give sufficient notice and express appreciation for the opportunity you have been given on the job you are leaving.  Go above and beyond the call of duty, making sure you tie up any loose ends, etc.

When you get to your new job, don’t make the mistake of being severely critical of your old job, and your former employer.  It doesn’t take a smart person to figure out, that if you speak negatively about others, you will also speak negatively about him, when you are not in his presence.   Get yourself an employment mentor, if possible.  Find someone, who is successful at the job, and learn all you can from that person.  You want to be that person that they just can’t do without.