They were both daft (her for inviting him in, him for gojng in) but, you know, denial is a powerful thing. I'm not surprised they did it.
The problem is the fact you are now facing 10 days with no financial support.
I'd centre your anger there.
The lack of financial support is, frankly, a powerful driver for people doing the denial thing. Deep down, they're worried about losing money and it just makes people do somewhat irrational things.
And then, of course, you end up having to isolate - and that's terrible, and worrying if you have no money.
Or you end up positive, and have no money.
Honestly, the lack of financial support is where I'd focus.
Don't shout at him - it's pointless and will do neither of you any good.
If you need to vent, send an email to your MP saying there really needs to be better financial support because it's driving transmission in all sorts of ways + people just can't manage.
You'll feel a lot better - and it may even do some good. 🤷♀️
(And I really get what you're saying. I'd be spinning. And I've also had to isolate - when I knew I was negative - and lost money. It's just awful.
Other countries encourage testing, even without symptoms, ask for isolation before test results, but crucially pay people while isolating. Can you imagine the difference that would make to your stress-levels now? And how it would encourage people not to go into denial & this decrease transmission?)