Yes! You are scared that he won't miss you and will just keep distancing more. *That*, in a nutshell, is exactly what is so hard about DB. It is completely counter-intuitive and requires a leap of faith.
The thing that you have to keep reminding yourself is that pursuing is what will make him not miss you and just keep distancing more. You have to do the opposite of what your heart says! As long as you're stepping toward him he will always take another step away. You have to walk in the other direction to get him to step back.
I can tell you with perfect rearview mirror clarity that this is way more effective than begging, pleading, trying to control, explaining, arguing, etc. None of it will do you any good. You have to step off that cliff, accept that he *might* just keep distancing, but if he does, there is nothing you can do about it. You need to surrender to that. If you surrender to it, it will make it much easier to deal with. It is not in your hands. Your very best course of action is to distance.
I'm very sorry for how you're feeling, I've been there! It's brutal and your heart keeps telling you to reach out to this person and invite them back into your life because you *know* you'll both be happier if they do. You have to fight that impulse and it will subside.
Accuray
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