That sucks man. It's been some time (about a decade now) but I went through the breakup after 8 years as well. Not fun. In hindsight it was necessary, we were in different places and needed to go through different things in our lives. The split was tough - I will forever remember standing at the foot of my stairs 2am one after she'd been gone some months, my job had also recently ended, and I'm in my late 30s thinking, "well shit, what is even left?" Of course life moved on. Eventually got a new, (much) better job, and got together with someone else (who is still here), didn't even really take that long. Although by that point I was strictly in "I do not wanna be in a relationship again!" mode, ironic right?
Anyway time will help things. Sounds like you are not some dumb kid and so you probably won't get all dramatic about it, but obviously let yourself have your feelings/get it out of your system. I will say that sharing a living space in the meantime is still going to keep ripping the bandaid off of a wound and preventing its healing, but you no doubt realize this. Until she (or you) is out the door, you haven't really hit that dreaded Day One yet. Even if it is "to make things more convenient" (for whom?) it's still dragging things out and keeping you both mired in whatever you want to consider this final stage as. The sooner you can resolve that & both get on with your lives, the better for all involved. Really it is kind of a (really painful) holding pattern until then. Not recommended.
As for moving on past that - hard to offer much advice beyond what's already been said elsewhere in this thread. Seek out some new things in your life, because it is a fresh beginning. If you have time and resources, getting yourself into a different environment (even if just for a short trip) does wonders for shaking one out of their rhythm. If you have friends somewhere cool, maybe plan a visit. If you can, maybe take a trip somewhere (relatively) exotic. Going alone can be daunting, but being part of a small thrown-together travel group is a wonderful way to get thrown into the thick of it with a small bunch of strangers who can become insta-friends while you are in some weirdo foreign part of the world for a little while. Otherwise, you will have to get used to being back "on the scene" by yourself which - well, different people feel different things about that, for many it is abject terror, so get on with it and start easing into it to make it a little less paralyzing. It is the cure for what ails you though. Finding other people to be around, in different places besides at home trapped on your couch. Go to see some live music, other kind of performances (I used to go to TONS of stand-up when I was single). A watering hole is usually a very easy thing to get sucked up into (don't do this if you are an alcoholic, but do what you need to get over the hump if you must and can handle it - for me it was a pretty good support cushion, when all my other resources were skint).