My husband of a year has just revealed to me his first wife gave birth to a surrogate baby while they were married ( between their own 3rd and 4th child but apparently he can't remember exactly. He failed to mention this before despite long chats about both our pasts. Nor has his close knit family. I am furious to find out so casually but then again I don't know why I feels so betrayed. Let it go or righteous anger?