can't decide

So me and my husband have a son together, he's 16 months. I fell out of love with him probably a year ago and I finally told him a few months back. We work opposite shifts to keep our son out of daycare and we always use each other's off days to do what we want without each other. I want my son to have his father growing up but I don't want to be unhappy because of it. What should I do??