Thanks all for the advice. I was worried re MLC a my understanding is I have to stand by, let it run and watch my marriage get destroyed in the process.
Quick Update is that she is struggling to find a new place. Basically she is having to rely on benefits and yesterday came down to earth when the lettings agent gave her a dose of reality re the type of property she could expect on benefits. This gives me more time but also gives her the sense of being trapped which I don't want.
She is being overly friendly/happy and then crashing into lows - bit like a rollercoaster.