Reply From Agony Uncle
In Singapore, from your situation withholding the fact that he was married is not official. However the fact that he was married and fathered a child does not mean that he is still married. Before you act you may be prudent to ascertain whether he had terminated the marriage in Singapore. Though he had not committed any offence did he have any monetary dealings with you; you may able to have a legal action against him. For that I need more details from you.