Patti, I'm not going to tell you what you should do with regard to your relationship.
But I'm going to post some snippets, that may give you a better angle on how to proceed.
Which is of course, ultimately, your choice.
"When the sex is great, it's 5% of a relationship.
When the sex ISN'T great, it's 95% of a relationship."
That comes from my Counselling manual.
'Desire is natural.
Fidelity is a choice.'
That one's mine, and seems to be spot on.....
In addition, I'd like to add I'm 52, divorced my ex- of 22 years and am in a relationship with a new man, and have been for the past 4 years.
Life begins at 40?
make that 40-plus!
There's more to his lack of libido than meets the eye.
With his OCD and previous drinking past (once an alcoholic, always an alcoholic - even one who doesn't drink. (This from my step-Mother-in-Law, who has been an alcoholic since she was just into her teens and is now 54 and teetotal. But she says she's still an alcoholic. Who happens to not drink....!)
I think it comes down to a choice for you:
Remain with him, go counselling and make it clear that you cannot commit to a continued marriage without any physical or emotional affection: How would he feel about you having flings?
Or:
Agree that it has run its course.
But whatever you do, don't do anything 'behind his back'
That way lies perdition.....