Ladies How Do You Deal With A Cheating Boyfriend?

This is funny and serious at the same.
Caught him red handed in his place on my way from work, decided not to inform him and wala!!.. he came up with a smooth lie that she is his cousin. And the girl agreed to bear the cousin with a fake name that even his family members dont know of.
My instincts told me everything acting was a lie because even his brother doesn't know about such cousin. Lol