If he wants to come home he will definitely find a way -- you haven't burned any bridges. If he is truly influenced by public opinion then the path of least resistance will be to come home, not stay away. It can happen that the barrier to returning becomes too great but that's really when the spouses have gotten nasty and vindictive. DB is about preventing that.
Affairs are based on fantasy. They are more in love with the idea of the other person they have constructed in their minds than they are with the actual person. Eventually there is enough behavior that contradicts this perfect image that the fantasy breaks down. When you start dating you're willing to put your needs aside and hide your bad habits, but you can't do that forever. If OW was such a good catch she wouldn't be running around with the married husband of a pregnant woman. Her dirty laundry is going to pile up and spill out of the closet, its just a waiting game. If he were totally in love with her would he be getting a second job and sending nice texts to his wife? No, I am sure the shine is starting to wear off for him, but if he is super needy he may cling on for quite a while.
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