Have been talking with my ex about getti...

Have been talking with my ex about getting back together. We're not totally back in yet, and even after a month of being emotionally cold to her, I get back around her once, after we try to just be friends, and I still find myself wanting more.
I want to take a good look at both possibilities. If I do get back with her, what should we both make a point of doing, and what are some signs that I shouldn't get back with her?