The risk of pursuing is much much more dire and detrimental to your situation than the risk of distancing. Therefore, given a situation you are better taking the path of distancing yourself instead of trying to pursue her or pull her closer. This is counter intuitive and why DB is really hard.
You do need to give her space to work through her issues and to come to miss you and what she had with you. If you're ever present, she will keep running and will never need to process her stuff or come to miss you. There is no risk of "slamming the door shut".
Most people's situations would be 1000% improved if they had immediately gone the other direction when their spouse walked away.
Acc
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015