Domestic Responsibilities ‘38M’ and ‘39F’

My fiance ‘38M’ and I ‘39F’ fight constantly about domestic responsibilities. We’ve been together for 5 years, lived together for 3 years and have been engaged for 1.5 years. He grew up in a home where nobody had chores/responsibilities and just learned how to clean a toilet earlier this year. We both have demanding jobs and often work 10-15 hour days and agreed early on that a 50/50 partnership was important to both of us. The only time he does anything around the house is if I ask him to do it and the responsibility of project managing him is starting to feel too overwhelming. Our relationship otherwise is wonderful and he’s a kind and loving person but I just don’t know what to do anymore. I want him to take ownership of the domestic duties and not feel like I have to manage him; I already manage a team at work, I don’t want to manage my partner.

If you’ve experienced a similar issue, how did you get through it and get to a point of 50/50 ownerships of domestic responsibilities? Any tips, tools, I will try anything!