@DesperateOldBag You've posted very early in the morning - UK time?
There are many things you should consider.
Not least that being unhappy is not doing your husband any favours.
Has he any idea how you feel? Does he want to be in a sexless marriage? Does he care ? Does he know he's been 2nd best for decades?
I'm not blaming you, but living this 'lie' for decades isn't good for either of you. You've deprived yourself of potential happiness - and him.
My take on it is you either make peace with yourself and accept this is your life for the next 20 or 30 years, or take action.
'Action' could be having counselling for a start. It will help untangle your thoughts and give you a way forward if you decide to end your marriage. You can contact Relate and have phone counselling.
You have a right to be happy. It's under your control- no one else's.
It's not wrong that you found a man who ticked all the boxes. But it's wrong that in your 60s you're still not over it. The mistake is not that you loved and lost, (we all experience that) but that you settled for someone who wasn't Mr Right.
And the big question is - why? Why did you settle and make do?
Fear of being alone?
Wanting children? - Bio clock ticking?
Not being aware he was Mr Wrong till too late?
These are the questions that you should ask yourself and talk over maybe with a professional.
If it's any consolation, I have friends in their 60s and older who feel like you. So don't think you are unique in being married to the 'wrong man' and not getting out of it. Marriages are not always what they appear to outsiders.
Do not waste the rest of your life and string along a man you don't really love.
You both deserve far more.