Sometimes in spite of all your best efforts the only thing you can do after the affair is let go of the person.
From The Chicago Sun-Times:
My husband of 26 years recently left me for a woman 20 years younger. His birthday is Oct. 30, 1962. When he left, he told me he also had an affair when our daughter (born Jan. 15, 2000, at 5:16 a.m.) was very young. Will I be able to find love again? How will this affect my daughter, who loves him very much? I was born Jan. 14, 1962, at 1:12 p.m.