This thread must be HTH for you, I'm sorry your hopes for your partnership hasn't come to fruition.
This is the problem with a lot of relationships though, one person has an idea of what they want and another goes along with it for whatever reason i.e. sex, protection, got comfortable etc. And often the got comfortable thing is the killer. Who wants to make changes when they are comfortable. Your DP has what he wants, sex, home cooking, childcare, ego boost that he is desirable, and hos own space as and when he likes it. Why would he change?
I think of relationships like a business, the best partnerships I've seen are between people who share common goals and principles. They agree with a plan to grow and develop that relationship and they implement that plan. They then keep planning and growing together. Sadly your DP is, for whatever reason, could be burned by a previous relationship and is fearful of getting too deep, or he could just be a lazy bum. The matter is that he is not willing to share your aims and goals. You've been honest with him about what you want, he's tagged along for the sex and home comforts.
Time to shake his tree, if he is serious, he will buck up, if he's not he will just find someone else who will do everything for him.
Men often like a bit of a chase, your DP got instant housewife. Become a girlfriend again and make hom work for it.