I think you're being wishy when you need to be decisive.
What happens if he tells the truth Friday. I think that will just set you up for another struggle, and another struggle, and another struggle.
On Friday, if you don't D him before then, go for the whole thing: NC, transparency, total honesty (with no rewriting history, no gaslighting, no blameshifting), IC for him (with visibility to you), MC, and anything else you want. Set up consequences for his foul-ups.
Keep the D active, and don't commit to R until you see consistent R behavior from him for at least 6 months.
Your H isn't working on R, so you have to stop, too.