
Yup, jus finished this bk recently. Nice read, should go try it if you haven't, especially guys since the protagonist is this man who had an early marriage, and a kid. At 30 years of age, he felt that he was missing out something in life since he married early. While his peers still haven't settled down, enjoying life in some sense, he's already tied down to a family and a child. He and his wife also never got the chance to enjoy life with just the both of them. As a result, he had a one-night stand with one of his colleague, and that incident, after being discovered by his wife, changed his life forever.
That's because his wife is a very capable, highly-qualified woman who gave up her career prospects for the sake of him and the child. She came from a broken family and made it a point that her son doesn't suffer the same fate. The protagonist, on the other hand, comes from a perfect family but also with the same goal as his wife, to give his son a perfect family. After the incident, his wife decides to give another shot at pursuing her lost career, leaving behind him and the child. In the midst of it all, he fell in love with a single-parent mum who had a daughter from her previous marriage.
He took a while to figure things out, how to take care of his child, and learning more abt love and marriage along the way. In the end, he seemed to have figured some part of it out, but reading the synopsis for the follow-up to this bk, Man and Wife, I think he fell in love with a 3rd woman later on.