Since it's hard to know if your spouse is truly done with your marraige or just needs some more time to come to his/her senses, if I were you, I would err on the side of caution. Why not assume that this is going to take much longer than you anticipated, but that, in the end, things will work out. "Act as if" you believe that your marriage still has possibilities. Do the things you would do if you envisioned a positive outcome to all of your efforts.