Sex less relationship

I need to vent this out im sorry. Myself and my fiance have been together for two years now, lived together for a year and a half. But since living together our sex life has dramatically dropped. It's gone from twice a day to twice a month if I'm lucky. We've spoken about it multiple times and nothing comes of it. I know for a fact ge isn't cheating. I have needs and this is seriously getting in the way....