Guys, Why do some men think it is okay to lie or omit information while dating?

I have been single about 2 years. I hesitate to date because of infidelity. I finally gave my number out and this guy lied within the 1st week. He said he had no children and it slipped he did. He admitted he had 3 and tried to explain it away that he "doesn’t like his personal business out there" & it wasn't a lie, but omission. Omitting mean not disclosing, he lied. But I know a lot of me that do this. I cannot find studies on this topic, but how often do men actually lie? And why do they lie or omit information to women they are dating?
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Guys, Why do some men think it is okay to lie or omit information while dating?
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