Thank you all so much.
'Decisive' isn't a word I think of in relation to myself. I am something of a laid back bimbler by nature. I guess I do have a strong idea about what I think is/isn't acceptable, though, so there wasn't really a decision to be made, just the practicalities.
STD check is a good thought :/
He has written me a letter, delivered by a family member. Grovelling apologies and wishes to 'work on it' with professional help, and making noises about vacating the house so I can be back in my home with my cat and my work things. This is good.
As expected, the excuse is not enough sex and feeling unable to ask for the kind of sex he likes (not specified). Dread to think what that is given his recently uncovered interests. I had slight 'the ick' before (new concept for me) and now the idea of touching him makes my skin want to jump off and run away, so even just on a physical attraction level, I can't see what's left to fix.
My parents are being incredibly good. We haven't always got along and tend to piss each other off when under the same roof, but they are giving me space but also a sounding board for thoughts and ideas as they occur, without trying to push me in any particular direction. They also agree this wasn't in any way foreseeable, so it's not a case of my bad judgement and chain-marrying idiots.
I enjoyed dipping into the single-life thread and have some more reading to do on that. Thank you, Gutterton. Some lol funny moments and much to envy. The idea of a space away from all the man noises, crashes, swears, farts, unnecessary coughs every 7.5 seconds... (that last one drives me up the wall). Before lockdown 'D'H used to do a hobby one weeknight and sometimes on a Saturday too, and particularly on the weeknight I relished how different the house felt, how I could have soft lighting, maybe a fire, a weird 'challenging' food that he doesn't like, and hang out in bed with my laptop, staying up as late as I want watching nature documentaries before drifting off to sleep.
I do need to be a bit sensible and not be completely swayed by this vision of the perfect single life (concerns of reduced income, transport since I can't drive due to my disability, etc) but as obstacles go, these don't seem in the same league as learning to want to be physically close to him again.
So I guess I need to decide about responding to the letter and, after talking to solicitor, get an idea of what my independent means are.
Thank you all for your insights and thoughts. Mumsnet women are wise and indomitable.