yesterdaystotalsteps123 mentioned the value of threads for other women who find themselves at the shit, hopeless beginning of situations like this, so thought I'd update.
Things are actually going okay. We're sorting out finances amicably; it's not the drag-out fight I feared. He seems to accept now that the relationship is definitively over and is flat-hunting, so still in the house but with tangible steps towards not being. We calculated that I put in about 80% of the deposit and ex agrees in principle with a proportionate split based on contribution, which will still allow him plenty to house himself. This will enable me to stay in the house without having to significantly increase the mortgage.
Feel things have progressed hugely in a week and I'm cautiously optimistic. There is still this big, dragging sadness about it all that hangs around most of the time. I'm pretty committed to being single for the foreseeable, so have these occasional fear moments about being lonely, never having a secret made up language with another human again, having to open jars on my own etc.
I also got a skeevy email from one of the sugar daddy sites that I signed up to as part of my investigations. A 'sugar baby' story:
^Patrick and I discussed our needs before we met. He's married - which is actually perfect for me because I can only see him a couple of times a month due to my work and study commitments anyway.
I could tell he was hooked as soon as he saw me. He'd spent years in a loveless marriage and I am a breath of fresh air in his life. Each of us is getting what has been lacking in our lives, so it's really a perfect fit.^
(not envy)
How did so many people reach adulthood with morals like this? Maybe I am naive. It certainly helps with the emotional detaching from ex. For him, I guess, this was okay and normal.
Anyway, I get to look forward to moving back into my house, re-arranging the furniture according to my preferences, and cuddling my cat forever.
It would have been much, much harder without your support, reality checks and common sense, so thank you, lovely Mumsnetters.