"My Fiance Has A Child Out Of Wedlock, But Kept It A Secret From Me"

Pls matured minds in the house, i need an advice. I just got the shock of my life today. I got to know that the man I am planning to spend the rest of my life with has a child out of wedlock. I heard this from someone close to his family and I confronted him about it. He said he is afraid to loose me, that was why he didn't tell me about it. That he doesn't have anything to do with the lady that gave birth to the child for him, and that the lady is already married. I am just short of words.