> My mum & dad have been together over 30 years
My parents had been married for 40 years, when, at the age of 60, Mum said she wanted a divorce. Dad was in shock. Although he had faults, he didn't see them, and he certainly would never have considered counselling.
Mum took Dad to the cleaners financially, and made a good life for herself. Dad just deteriorated mentally, he couldn't cope with having to fend for himself. I once visited him as he was getting Sunday dinner. A tin of soup, eaten straight from the saucepan, to save washing up. Heck, he didn't even know where his sock drawer was, when he got out of the bath, Mum had always laid out his clean stuff on the bed!
Women are far stronger than men. Speaking from my own experience, my Dad desperately needed my support. With Mum, once I had helped her choose a new house, and get everything in place, she was so happy to be away from Dad, that she flourished. Still going strong at 81.
Dad however, was all bluff and bluster about doing whatever he wanted, and going to the pub when he liked. It was an act that people believed. Inside he was a sad, broken, lonely old man. His mind deteriorated, and he died a broken man. I think your Dad will need far more mental support than your Mum.