My SO and I have been in this weird, confusing relationship for a year and a half, We have a three…

My SO and I have been in this weird, confusing relationship for a year and a half, We have a three week old daughter together. I'm starting to feel like the only thing we have in common is our daughter. It's force conversation unless it's about her. We don't hardly see each other because he work 12hr nights and sleeps all day. I love and care about him but I don't feel like I'm in love.