Mal- we al know that you manage to have a great sex life, and that in that you are maybe slightly out of kilter with the average couple, in LTRs. This is not a case of
just from my own experience of talking to friends who have been married 20+ years.
There is a huge amount of scientific evidence which shows that for most couples the initial chemistry subsides after 12- 18 months- this is a biological/anthropological fact based on how long it would take to conceive and raise a child.
This is not to say that sex dies completely far from it. But for many couples, especially those with children still at home, it does dwindle to nothing, due to lack of time, energy and thin walls!
I've got a close friend whose marriage has been totally sexless for 10+ years. For her, it's all linked to emotions and she simply doesn't really like her DH any more. He works abroad , comes home at weekends, and she has a nice life most of the time- helped by the fact he earns a tel. no. salary.
She's talked about their lack of sex to other close friends all in their late 40s, 50s and 60s, and many are having very little sex.
In her case, her DH simply accepts it as he doesn't want a divorce.
Not saying she is right- my own view is they should split.
OP thanks for telling us how your marriage was once full of passion BUT you have avoided the points made by me and others that you seem to be rnning shy of actually talking about the real issues when withthe counsellor.
I've had counselling recently and know that usually they say nothing at the start of each session- so the ball is completely in your court to start the session in the way you want.
really, rather than all of us try to 2nd guess what your wife thinks, the only answer is to ask her.
if she won't, or can't tell you- then I think this in itself is a reason to seriously think about splitting, because it shows a lack of respect for your feelings, and a lack of emotional investment in your marriage.