At my limit

I’ve been in a relationship for 4 years and everything has been my responsibility the bills,the kids, the house everything he works and does what he wants with his money his priorities have never been in order I’ve threatened to leave 2 times and both times he asked for me to give him time to be the man he know he can be…well that has still yet to happen. I’m at a point now where I don’t even want it I needed what I needed from him then not when I’m already fed up, I don’t know how to express to him that I am seriously done I’m not mad, upset or anything I’m just done.