How do you tell someone that you are sorry for breaking up with him/her?

You must tell him/her that you are sorry for what happen and not meant to do that kind of decision, and make sure that you are sincere in saying sorry

wait are you saying that you are sorry that you broke up with that person when you really did not want to break up? IF that is the case then yes you will have to deal if the other person rejects your apology and wanting to get back together but if you really miss this person and feel you have made a m istake by breaking up with him or her, then I would go back and swallow your pride and ego and just say that you made a mistake. perhaps you were too hasty when you first had broken up because of whatever history the two of you have. You really have nothing to lose here other than the fact that you already broke up, so the only thing that can happen is that you will not get back together but you should be honest with the other person abut how you are feeling.

If you already broke up with them I think that they are hurt enough and if your going to be breaking up with them, there is no easy way at all to do this, just be gentle and be sure to explain why honestly so that they know why., not knowing is the worse part of it all.now if you just want to talk to him/her and apologize for breaking up that could go either way so ya I would put my ego aside and still just be honest and straight forward about it.

There is no easy way to do it. I would say just say how you feel and be prepared for the worst. If it comes out good then you win if it comes out bad at least you were prepared for it. Good luck to you there.