I've been seeing someone for 9 months. He is recently divorced and has 2 DC who are 10 & 13. They found their parents splitting up difficult. They were both very unsettled - now he's bought a house (he was renting a flat) they seem to be getting better.
They don't know about me - which is fine. But he hasn't told his ex wife yet. We go out together and so are seen together a lot, his friends know too but he hasn't told her. She's been difficult through the divorce, she got caught out by the judge not declaring money and not being 100% truthful. He says he will tell her eventually but I think he thinks she will make things difficult for him with kids and getting his last bits from their old house.
I'm not sure if I'm being kept a secret as he doesn't want conflict with her or because he thinks she's better than me (not that he's ever said that!)