So sorry to hear this. It hurts so much.
Although you have the 'emotional' evidence, you don't have enough hard evidence yet.
Send him a text/email about tax returns or summat regarding financials, to establish that you are a team. Then, continue your reading everything you can regarding the financials and the house and copy them (the text PROVES that you have the copies with his permission this is important court wise). Start squirrelling cash from shopping.
Don't win the battle to lose the war. I am not talking emotions here. Think long term.
Then: hire a PI to follow him to said address and hopefully you will get some pictures of them having a smooch hug 'I've missed you so much' .
With the papers and the hard evidence, BAM! Throw him out on the spot. Let OW deal with his shock and depression of losing his family. Let him mope around in her space!
But before this, YOU MUST have 1. seen a solicitor, 2. apply for an urgent court application for funds. If he is anyone in his company people finding out is a big compliance ball squeeze. PLEASE PROTECT YOURSELF.
Emotionally, in the mean time the only thing you can do is during a quiet time in bed say to him 'Jim (or whatever his name is), have you ever done something you feel really bad about, that has moved you away from being the man you want to be?' and wait IN SILENCE. Do not speak after this point at all.
If he is capable of decency it might be the impetus for him to start thinking. But don't hold your breath. OWs are very very addictive and like Skye said, are more important to them than their own children and family.
Imonly, I am so sorry. I tried very hard in a pathetic co-dependent fashion for 4 years to keep my family together after the discovery of nasty behaviour and a breathtakingly disrespectful affair (conducted in my house, the kids and OUR bed). He did not change at all, and I woke up to how selfish he always was.
If with the shock of steely and determined behaviour your H worked really hard and looked at himself and showed remorse, then your marriage might get better.
But the odds are very low and affairs devastate everything. We are here for you... You WILL survive.