Ending an affair can be a very difficult proposition. Depending on the length of time and the corresponding emotional investment associated, your affair may be a situation that is hard to leave. However you must remember that for the sake of your marriage, it has to come to an end.
In determining how to properly exit an affair, it is invaluable to recognize the initial cause that started your fling. Most likely some form of turmoil within your marriage spurned the affair, because this new relationship in one way or another filled an emotional or physical void that was not being met. Or perhaps the affair served as a distraction to addressing the real issues with your significant other.