I'm not caught up on your sitch, but do you guys have goals set up for your separation?
With a firm time frame (the six-month lease) you seem like good candidates for a separation with clear goals. There is a marriage therapist who has a book on using separations productively. You might want to check into that.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16