Just smile and say:

I didn't like his girlfriend.

"He's a cereal cheater. He like to move from Captain Crunch to Frosty Flakes to Trix. I just could not keep the right cereal in the pantry."

LMAO!!!! I like StormPetrel's response!!!

Just say that you preferred monogamy and he didn't.

fiveempires: "We divorced because of his girlfriends"
discontent: to kids "Mommy made a promise to Daddy when they married that they don't have boyfriends or girlfriends anymore. Mommy broke that promise". to family: "Because we are married, I'm not ok with her having boyfriends".

I have been blunt. I've been lied to for 22 years, so I tell the truth. She cheated. She makes up every excuse in the world but the bottom line is she slept with other men. This wasn't acceptable to me that's why I filed for divorce. People around here are slowly learning the truth.

And I think I will use the line "I didn't like her boyfriend". That about somes it up.
Good luck to you and stay strong.
-HUGS-

I say something close to Storm's. I usually say, "We got along great, he just kept forgetting he was married and kept dating other women."

He didn't stop dating when we got married?

Discontent. You are incorrect
Keeping your wife's secret if being a serial cheater will suck the life out of you and leave your kids without a real father
Your wife is an awful mother , she puts her pussy before the long term best Intrest on her own kids

Two sides to every story, in my case of cheating wife... "her side and her boyfriends side "
Reality is , I just shrug my shoulders and say that it is complicated

Tell people the truth : it's not your responsibility how people respond to your truth.

@Discounted You probably have the ' Mr Nice Guy Syndrome' your wife cheated on you, her sins are her responsibility and hers alone. You tell your family members and your kids the truth : their response is not your responsibility but hers. You are not the one who cheated.

Maybe that's why she cheated several times, because she knew you would not expose her and protect her false image. " Exposing an affair usually force her or the OM to terminate the affair"

By the way, there isn't anything to think about : leave her, she left you a long time ago.

There are two sides to every story, and then there are the screen shots

Tell them you Won the Lottery and didn't need him anymore ; )

I just say he couldn't handle life and walked. I love everyone's responses. Wish I had something clever to say.

What I'd really like to say is "he left me for his mother" but I do have some class left.........

I am so sorry you are going through this, maybe just tell them it is complicated. I have been married three times, divorced twice, I left one husband and the other left me, my situation's both were complicated, it's important to tell only what makes you feel comfortable since it is your life they are asking about. Good luck.