Have you ever lied about being single? if so, why?

I have a friend who just started dating this guy. It’s probably been about a month now. She’s telling me all these good things about him- but when I meet him- he’s actually the ex of another friend of mine. A friend that she doesn’t know, of course.
He basically told her that he was single and had 2 kids. When in reality, he’s been in a relationship for 2 years now and have a child by the woman he is with. Which would mean he has 3 children instead of 2.

I’m really confused as to why he would lie as if she would never find out.
Have you ever lied about being single? if so, why?
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