It is advisable to stop all communication with him. Therefore, remove it from the phone address book and do not mess with him via the Internet. Avoid meetings in real life. Surely he will attempt to establish a relationship with you, but you must stand firm. Be consistent in behavior, do not step on the same rake twice.
Stop idealizing his person. Look at it impartially. If he, being a married man having an affair with you, it is possible that he had a romantic relationship with the other girls. Would you like them graze husband? Probably not. But some men to approach changed almost impossible to change. They do not see anything wrong in relationships on the side, treason for these young people - is the norm. Link their future with such ladies' man - a huge mountain, and who did not want the enemy. As a rule, any wrong man besides a sophisticated liar, able to skillfully manipulate the feelings of others in their favor. It is specifically pathetic girls complaining about the uncomprehending wife, while the number of noodles on your ears getting bigger.
Also, think about how hard life of his wife. Surely it brings up their joint child, while her husband entertained with mistresses. Put yourself in her place, and at least mentally apologized to her. Still married men would have no one to change, of course, except for workers oldest profession if free women did not agree to the unenviable role of mistress.
Some people believe in the triumph of karmic justice. They believe that a person has done wrong, certainly in the future will be in a similar situation, but with the reverse side. Therefore actively bathe his sin, refer to their religion or other spiritual practices, unless you want to later try on the bitter fate betrayed wife.
Begin to live with a clean slate, fair and square, and then happiness will not be long in coming.