Just an update from me and I appreciate I'm not fully following your advice at the moment.

I got through the night with a couple of hours sleep.

I've ended up having a one hour telephone conversation with my wife. A bit to clear the air, share frustration that she is dating so visibly at this early stage and go back on some topics. Explained that contact will need to be cut. We ended in years but both accepting that it is the end and she will now need to proceed with her new relationship and go from there without me being around. She obviously knows it.

Okay it goes against everything advised so far but will now have to fight to comply with the detachment. I'm broken and can't keep being broken on multiple occasions in the coming weeks and months. I need to accept she is gone and never coming back, even if I'm convinced I could have been really good for her.

I can't see beyond the next hour at the moment. I've spoken to my doctor and they will give me low dose anti-depressents. I'm awaiting a call back from a work counselor and will look into permanent therapy.

I'm sorry I've been unable to follow the advice so far, it is such a shame I didn't find this site a year or so when there may have been time and space to change her thinking and before someone else gave her a distraction.