My wife is pretty open about her affair. All of her friends know, pretty much all of her family knows. They all call it an affair, but she doesn't see it that way, so its nothing to be ashamed of. Apparently if you fantasize about another person for months, then don't talk to your spouse about how unhappy you are, and then suprise your spouse with the fact that you want to be seperated, before you finally escalate an emotional affair to a physical one, its OKAY.
Its not an affair in her mind. Because what she is doing is different. She was unhappy before she found him, and she is 'in love', she feels entitled. I guess she didn't get the memo that she is acting exactly like almost every spouse on this board, and its exactly the way most affairs start.