Separation help!

Ok. So I need some help please. I am currently living in the family home (a small farm) and on March 28th my covert narcissistic husband and I separated BUT due to the Corona virus, we have had to stay under the one roof. I moved out of our bedroom and drew up a plan for us to pay half of household expenses (excluding our own personal expenses) and to care for the children week-about. It is May and he still refuses to look at it. I have been paying all the household expenses but documenting them in a ledger. Every time I bring up money he gets verbally abusive and calls me horrible names and yells at me. Five minutes later, he acts like nothing has happened. I was going to try to buy him out so I could keep the house for the kids but it doesn't look like I can afford to. Add to this the manual work that is required to maintain the house and property we have, and I just don't think I can do it. So, we will probably list the property for sale in the near future. My question is this, should I move out now into a rental property so that I am set up when the house sells or should I stay? He can't afford the repayments on his own but he wont move out as we stand now. That would mean I would have to pay half the mortgage until the house sold as well as my rent but the children and I would have the security of knowing where we will be living once the house sells. Money would be tight and I think he will just drag things out. Should I tell him that I want to leave and ask him to choose whether he will stay? The thing is, I think he will say he will go but then wont do it. I don't know what to do. Any advice would be appreciated.