My partner just has a low sex drive.
He isn't on any meds, doesn't suffer from excess stress or any other similar things. He just plain and simple has never had a high sex drive, just like I have never had the urge to eat certain foods, or do certain sports.
However we have a very strong relationship, with plenty of touching be it holding hands or cuddling.
A low sex drive doesn't mean no children - I am now 3 months pregnant.
For our entire relationship we probably have has sex only every couple of months, although sometimes it will be several times for a few days then nothing for ages.
So don't worry - enjoy what you have, and remember there are plenty more ways to get sexual pleasure other than penetration.