how to breakup with someone?

The best way to breakup with someone is to first see what kind of person they are. How you think they are going to react when you tell them the news. If it is a person who will get mad and scream, then it will be good to breakup with them in either a crowd or over the phone. That way if it is in a crowd they will not make a scene (hopefully), and will not fight with you. If it is over the phone then there is no way that they could hurt you. If they start to yell at you then you could just hang up on them and turn off your phone. If they come to your house, just make sure you lock your doors.
Is your girlfriend or boyfriend is gentle then go over to their house. Say that you want to talk to them. Do not lie and say you want to watch a movie or something. Just tell them the things you love about them. Then tell them the bad things and say that you cannot handle the negative things in their life. But if you want to breakup with them just becauce you want to. Then Just tell them straight out that you want to break up. If they start to cry, comfort them. Don't just walk away and leave them to be by themselves. That is the worst thing you can do to someone. Tell them that they will find the perfect girl/guy in the future and that you two are not meant to be together. Just stay with them for a few mins then ask if they will be fine by themselves. If they say yes then thats your cue to leave. if not then stay about three more mins then say you have to go and leave.
The worst thing you can do to a girl/guy is to break up with them after you have sex. Thats what jerks and a-holes do. The other thing is do not go out with a person then breakup a week later. The best thing to do is to talk to them first to see if both of you can get along. If so, then ask that person to go out with you. That is how you find the right person.