Being dumped is one of the most devastating things that could ever happen to anyone. Therefore, one should always weigh their reasons for walking out before they damage someone's life permanently.

[edit] StepsBe certain you want to end the relationship. Discuss any problems openly and directly with your partner before you make up your mind. Many women and some men will be suffering for years and never bring the problems up with their partner. This isn't healthy. Feel free to seek couple's counseling. Also, don't forget about taking breaks, or trial separations.
Do not make your decision on your own or in anger. Get input from trusted friends. Parents usually have great insight.
Make sure that you choose a time and a place that will be convenient for both you and the person that you are about to dump. Don't break up with someone right before they have a big test or are about to go to work. Fridays are a good choice. If you are in a hurry to leave the relationship tell the person you need to take some time off.
Do it! Pick up the phone and end the relationship. Chances are you will waver if the person is obviously hurt and surprised. Hold strong, you have already made your decision. This does not need to be a big production. Ending a relationship on the phone is acceptable and even recommended. It is much safer and prevents the dumpee from the embarrassment of having you watch their torment.
The person will typically react with anger or with wonder. If the person responds with anger, tell them you are going to hang up and talk to them when they calm down, but you have already made up your mind. If they have questions, give honest and direct answers. Lying will only frustrate your ex. If you are not ready to answer the questions, be honest and admit to them you need more time. Set up an exact time for you to discus what went wrong.
Once you have begun the process, establish concrete boundaries for your future interaction. Be polite, but firm about these boundaries and make it clear that they are non-negotiable. Let him or her talk to you when YOU are ready. At the same time, it is important to find closure. Do not cut the person off without a chance to discus what went wrong. Try to make the failed relationship as valuable as possible by turning it into a chance to learn and grow.



[edit] TipsDon't raise your voice, even if the other person begins to yell. Try to keep calm and if it gets too out of control, just leave and let him or her cool down.
Comfort the person if he or she needs it, but don't get too attached! Voice your opinions if things are getting too uncomfortable or not appropriate. You don't want to be drawn down the same path.
Don't make a long list of reasons as to why you are dumping them. Keep it as short as possible, pick one true reason and give it to them if they ask. Don't argue about it or try to prove yourself, just stand by your decision.
For a less direct approach, try not to be as touchy-feely with your partner. This might send the message the 'spark' is gone, and you want it to be over.
Spend some time apart for a while; give the other time to cope before they see you with another person. A minimum of one week is usually a good rule, but varies depending on how involved you were and for how long you dated.
Don't spark and argument or be confrontational. If necessary, wait until everyone has calmed down and have the break up talk.
Do not wait until after sex to break up with someone. It's hurtful and very selfish.
"Being friends" can sometimes prolong the break up. Sometimes it is best to make a clean break and spend time apart.
Don't play games or start ignoring the person before you break up with them. If you want it to be over you should break it off sooner than later.



[edit] WarningsNever make the other party fully feel responsible for the break down. Always name your shortcomings as well to make the decision a just one.
Avoid giving them hope that it can continue. If you have made the decision to move on, then you must make that absolutely clear... if there is still something salvagable, then don't break up and instead focus on how you will work together to salvage the relationship. Breaking up is not a threat or a way to get someone to change.
Don't send a note -- do it in person!
Don't back down if they begin to cry. Remember why you are doing this!


source: http://www.wikihow.com/End-a-Relationship