First of all, you are better off than a lot of people in similar circumstances, ie. no children and no mortgage involved.....................these are huge and can be the result of many discussions.................
Let me ask you this, "Do you want to be back here in 10 years, posting "I am a 41 year old........?" Even if you feel you may not be strong enough yet to make the final decision.................my advice is to set the wheels in motion..........................as far as I know, if he shares the lease and there's no threat of physical harm....................you have but one option................and that is to move out. Having said that...............research new places, get emotional support - friends and family, don't worry about your stuff..............stuff is just stuff............but if your really attached to somethings...........research putting in storage, store at friends place, or a plan to do a massive clean out come moving day..................keep all your receipts in a safe place............in case ownership is questioned..............etc
No you shouldn't have to leave a place that is yours..............but do you value your sanity more than a piece of property? It's about empowering yourself................even if it takes a year or two to make the final move............at least you gave yourself an out and you'll feel stronger mentally and physically.........................Keep dancing!