Treat Each Other With Respect
Even if the romantic feelings are gone, you probably still care a great deal for each other. Remember that when approaching a breakup situation. Treat each other and your relationship with respect. Try not to yell or act irrationally. If the problem in your relationship makes you angry when you talk about it, try to wait until you can keep your emotional responses somewhat under control before discussing that problem as a reason for ending the relationship.
Understand Why the Relationship Is Ending
Breakups can happen for any number of reasons. Before approaching a breakup with your partner, examine for yourself why the breakup is happening. If necessary, consult a close friend or loved one about your feelings. Understanding why your relationship is ending will help you to deal with the breakup in a more rational manner helping you to find closure.
Don't Dwell on the Past
Don't use the breakup as a reason to bring up every bad or inconsiderate thing your partner has done over the course of the relationship. Remember that while those may be contributing factors to your breakup, they are in the past and should stay there. This is especially true if you are hoping to maintain a friendship with your partner once you've both healed emotionally from the breakup. If your romantic relationship has come to an end, simply say so. Though reasons for the breakup will probably come up, concentrate on the current problems at hand, not the past.