Just realised wife of 12 years is having a MLC

[Detrmnd]

I decided not to raise this tonight as it was just too much for me to keep cool if it escalated. I am seeing D after school tomorrow so I will confirm if it is ok with her before parents evening then we can discuss it afterwards. She was in her bedroom on a separate floor and the D was going up to ask her something.

Honestly I think D has heard a lot more she is of an age where she loves to listen in and I am 90% sure that she knows about W's A but doesn't want to tell me as she is firstly concerned that I would then go crazy and probably B doesn't feel she can unless she is 100% certain.

How should I set out the boundary? In fact how do I go about setting all boundaries? I am travelling with work again next week and will be re-reading DR so any help meanwhile would be great.