I was with my ex for years and we had a 6 month patch where my libido just hit rock bottom.
We had to add a bit more spice into our lives. Took a little effort but it worked. We just made a point of going out for drinks together without our friends, I started dressing more provocatively again like I did when I met him etc. (I got lazy for a while).
My pill also wiped out my libido, so I changed contraceptive and that helped too.