My DH had a lower sex drive than me, and it almost drove us to separation. Op, I do hope you have your eyes open, and don't be blindsided, if your DH finds affection and sex elsewhere. In my experience, this is how this story usually plays out. Does he want sex? Do you care? Is there a lot of rejection from you? If so, you could be sitting on a time bomb.
In our case, my DH had anxiety about his performance, but once he started taking a drug that fixed that, his sex drive made a huge come back.
The difference this has made to our (long) marriage has been immense. In the last month, we've had sex every day - granted, we were on holiday for most of that time, so our jobs weren't getting in the way.
It has easily been the most erotic month of my life (and I hope his). We've even had sex outside. For context, we are both in our 50's.
I've noticed other changes as well - we cuddle more, touch each other when in passing, send more loving texts, place more kisses on texts, we are kinder to each other.....I could go on.....but it's way more than just the physical side.
We do fancy each other a lot though - and did, even when the sex wasn't there. I did not want sex with my 1st H (at the end), because he felt like a brother to me. I think that's the death knell in any relationship. Whereas with DH, even when he was not being sexual with me, there's no denying that he is very handsome, very manly, 6ft 3, the typical, tall dark handsome.
I guess you think you're happy Op, but sometimes, when you haven't had sex for ages, you forget what you're missing. I wonder if you would feel the same in a new relationship? Are you bored of your DH? In my opinion, you are missing out on so much.