Why are Kenyan men ashamed of their wives?

What is it they are ashamed of?

I have a male colleague whom I worked with for over three years, and not once did he bother to mention to me or anyone in the office that he was married.

He acted like a single man, and flirted around the office like any other warm blooded man on the prowl. He wore no ring, and had no pictures on his phone or computer to contradict the assumption of him being a bachelor. And not a single word was ever uttered about a wife.