What I don’t really understand is if he’s trying to restore the marriage why does he want all these days and weeks apart
Well, quite.
I don’t think he does want to save the marriage. He just doesn’t want anything to be his fault. So he goes to therapy to try and get justification /validation for his behaviour, and to be able to say “I tried...it wasn’t me”
Because it doesn’t fit his narrative of ‘everyone has shit on me’ to be honest and leave you when he fell for another woman and continues to moon over her.
I would send him the ‘it doesn’t work for me’ message about therapy, and also message the therapist and say you have been reflecting on things your H has said and you no longer wish to pursue the chance of reconciliation, so will not be at the session on Thu. You do not know whether x wishes to maintain the appointment.
Do this Monday morning to comply with cancellation agreements. Calm, professional, assertive, in control.
You haven’t said whether your children know? I honestly think you should tell them. The bare facts, don’t slag him off, let them know they will want to be in touch with him too, but tell them how distressed and vulnerable you are feeling.
Actually I guess they do know since he is in a flat?