Trust has gone

I'm the one with ADHD - it's our 15th wedding anniversary tomorrow (18 yrs together), and at the end of July he started acting out of character (right after he went to visit family and then friends in his old town).
Since then, he has been secretive etc and then disappeared off to his Mum's on his days off- this was when I suspected he was cheating so asked him outright if he would be seeing a certain "friend" - he lied, said no and went to his "mum's". The following morning at 4:45am he got two missed calls to his mobile (which is connected to our Alexa) from his "friend". He got home and I questioned him about why she had called - he made out that he didn't know she had and I told him how I knew! He admitted he'd stayed there and said they'd only kissed - then said it's all my fault because I am (extremely) untidy and don't "put out" more than once a week! I asked what happens now and he said "probably divorce"? She'd called his phone as he'd lost it somewhere in her house and they were trying to find it.

Next day he wanted to draw a line under it but I cannot trust him as he is still texting her (and then deleting the messages - yes I'm a bad wife and I checked)!

I cannot afford to leave or pay him off and for the sake of our son (who is already upset by the tension), I want to keep the peace. But after more than a decade of being belittled and gaslighted by him, I had already given up hence the chaos and lack of enthusiasm for intimacy.

I found the audiobook that accompanies this blog and we have both started listening to it (separately). He said "it is very interesting but you can't use it as an excuse"!!

I came to the relationship with everything - House, money, furniture and now it seems that I will leave with nothing but our child and dog (son has already told me he "has lost all respect for Dad and when he leaves we must keep the dog". Our child turned twelve four days before hubby cheated (and six days after starting high school). 
 

I am so angry but have to fake being enthusiastic for our son's sake and for everyone else. I've told my boss and a couple of friends but not family or anyone else.

They ALL agree that there will have been more than "just kissing" and I'm not naive enough to believe him. I just don't see how we can move forward from this - I've had inklings before which funnily enough is when I started losing interest and when menopause kicked in early which exacerbated what we now know to be ADHD.

 

Sorry for my long winded rant, I just needed to get it out there!