Ok, so DP and I have been together for about 6 months now, both separated from our spouses, both in the process of divorcing. We both have a DD each. My DD, nearly 4yo, met DP a while ago, introducing them to each other very slowly, gradually building on time spent together, until now she sees him as 'part of the furniture' if you like. DP and his DD is a different matter. She is 10 and he hadn't told his STBEx or his DD that he was seeing anyone. His reasons were that he knew what the reaction would be from his Ex, in his words she's an "unexploded bomb", and that if she found out then she may take him to the cleaners during a divorce which until now has remained as amicable as is ever possible in these situations.
However all best laid plans go to waste and on Saturday night DP got a call from STBEx saying that he'd been spotted hand in hand with someone and asked if he was seeing someone. He said yes and then the whole world imploded. I could hear her shouting at him over the phone from the other side of the room. I swear she perfected circular breathing because she just didn't stop.
Long story short (I could go on...) DP saw his DD yesterday afternoon, with STBEx, who had calmed down by then goody for her and told DD that he was seeing someone. And this is where I lose perspective and need your help. His DD is now, understandably, asking a plethora of questions, I guess part of it is reassurance as to where in the pecking order she comes (this is supposition as I've never been in this position before), but she asked him if we'd had sex. And he told her yes we had. When he told me this I hit the roof. To me that is private between me and DP and, I know that she has questions and he wants to be as honest as he can be, but IMO he should've said that things like that are personal.
Am I being naive/immature/childish/unrealistic? Is this normal from a 10yo? I've not even met his DD yet she now knows something so personal about me. IMO it was not his information to share, it was ours. I feel like my life is now open season to be raked over with a fine tooth comb just so DP can feel more at ease with his DD finding out he's seeing someone.
BTW, just for a bit of backgroung, me and DP have known each other through work for over 2 years. He has been separated from his Ex for over a year and I have been separated from my Ex for 9 months. Despite no interest shown towards each other before 6 months ago his Ex apparently had issues with me since we started working together although I was unaware of this.
Apologies for the long post but as my first post I wanted to give as much information as possible.