His perspective
When He Feels Like a Utility, Not a Chosen Man
He can be dependable and still wonder whether you want him beyond the things he does for the family.
Dependable can still feel invisible
He drives, fixes, pays, remembers or steadies the family. When something breaks, he is needed. When nothing is wrong, he can feel strangely invisible.
He may not ask for praise. He may be wondering whether you still enjoy being with him, notice him as a person, or want him as a lover. Being useful is one form of belonging; it does not answer every longing. Sexual distance may make that question sharper, especially if he is always the one who reaches.
See the person behind the work
His loneliness does not prove that you have failed to appreciate him. It also gives him no excuse to withdraw as punishment or seek admiration elsewhere. Ask whether the marriage has become a place where both of you are mostly valued for function.
A specific thank you, an invitation to sit together, an affectionate signal you genuinely mean: each can make the person behind the work visible. If there is a persistent sexual gap, talk about it as well. Compliments cannot be used to cover over a problem that still needs both of you.
Reliability can become strangely invisible. He may hear thanks for the school run or the repair and still wonder whether anyone is interested in the man doing it.
Being chosen can be signalled outside sex: curiosity about his inner life, affection with no task attached, appreciation that names him rather than only his output.