Dear Bunmi,

My wife and I have been friends with a colleague in the office and his wife for over eight years now.

Unfortunately, he is having an affair that is not a casual one. When he is with this new girlfriend of his, he tells his wife that he is with me. I have covered for him so far but I hate lying.

My wife would go bananas if she finds out I condoned something like this.

Also, it is too close for comfort. Yet I feel I should be there for a friend.

Lately, his wife has been blaming me for keeping her husband away from their matrimonial home. What should I do?

Johnson, by e-mail.

Dear Johnson,

I am all for friends helping each other, even doing the occasional moral  misdemeanour for each other.

But you should draw the line when it comes to getting in the middle of each other’s marriages. You might end up being the cad.

As soon as you can, tell your friend that you know his affair is his business and that you’re not going to squeal on him. Then tell him his alibi is his problem, not yours.