I have a thought...I think you should have staved off this request of hers. She dropped it on you in counseling because she probably figured that you'd drag your feet about that if the counselor wasn't there.
Honestly, I don't like it, but there are plenty of people on here (desperate people?) that think you should avoid separation at all costs. I can't say they are wrong, but it will be very hard for you to escape your self-imposed limbo in this circumstance. I don't think I would have agreed, or if I did, I would have said, "for a month maybe, until you can find somewhere else to be". Now that you already committed to this, I'd start actually making this a roommate situation. Go out, come back when you want, get a life, and do whatever you would if you truly did have a roommate. Make sure that you both have completely split your finances. Make sure that you don't allow yourself to be in limbo. Start doing things to work on yourself and make your SINGLE life as fulfilling as possible. You are only in limbo if you allow yourself to be. Sure, your love life is on hold, but that doesn't mean everything else has to be.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer