Thanks guys. I think I realise there are no magic bullets in this, but was curious to see if there was anything else I should be doing to be sending a stronger signal that her being in an A and lying to everyone around her about it is not ok.

For example, she's told me that it may take her at least 2 months to find a place to move out to due to budget constraints. I'm not sure if I should be pushing harder for her to be out by a certain date - I would certainly like her to be out sooner because she's cake eating whilst being home.

LH, on kids, you're right. I think its a blessing and a curse. I do think not having kids has made it easier in her mind to rationalise her actions. It should also be easier for me to walk away, but I'm not sure I'm there yet. All I know is that 6 months ago we were trying. Would it have changed things if we were expecting? Or is it a massive bullet dodged? I don't know.