Some of your story Irene resonates with my own. Living with DH was 'okay', given that he is/was a high-functioning alcoholic, whilst he was working.
He retired as soon as he could, at 60, whilst I carried on working F/T doing a job I loved. Very soon I would be arriving home to a mean and moody man, fed up being in his own company all day and tired of 'looking after the dog' (a dog who was never walked by him but he did take over the feeding of her).
I reduced my hours, thinking that would make life more bearable for him and would ease me into a reluctant retirement. The reluctance was that we had no shared plans, no shared anything. He gradually stopped driving, stopped shopping for food, he did still do the cooking from time to time, and he would disappear to bed around 3 p.m. for an afternoon nap (nothing wrong with that but it was fuelled by his alcohol, which he started drinking earlier and earlier in the day) and he would stay there until 7 or 8 p.m. This meant I had often cooked the evening meal and sat and ate it on my own.
We stayed in different rooms in the evening, me watching the TV, he watching stuff on his ipad and smoking (I'm a non-smoker).
Eventually he stopped having baths and showers, just washed his face and hair in water. The towels and pillows he used smelled. He started wearing the same clothes in bed as he did during the day.
He was impossible to confront with this issues as he has a narcissistic personality, I read about this a couple of years ago and he ticked most of the boxes. Hence he is 'okay, wonderful, the best' and it is everyone else that isn't. The drink meant that it was often 'light blue touch paper and retire' and he could rage for hours.
Two years ago someone said to me 'You deserve better' and I realised I had fallen out of love with DH. I left. At the end of this month I can start to divorce on separation grounds. I have never regretted leaving him, apart from missing a cup of tea in bed at the start of the day.
I now have a wonderful social life, lots of genuine friends and my calendar is full.
I do miss having a special 'someone' but heyho, its 2016 and anything can happen. 
I suppose I want to say that, parting may sound scary and it certainly brings out every emotion under the sun and it is not easy... it really isn't easy ...but time can bring a healing.
DH now has a girlfriend (she was lurking in the background), has been abroad on holiday and has a car again, so I think it shook him out of his skin.