I was confused with detachment too, but I agree with your interpretation. We should try not to be affect by our H emotionally rather than cutting H out. I think it's important to keep up the positives and focus on the positives. I also think it's important to keep building on the friendship and be supportive. Why else would they want to come back if there's nothing good to come back too? But that being said, I think I will let him earn my time and attention gradually. I have a 17 months old, it's impossible to go dark. He's here like every other day.
I think my H is involved with someone too, although he denies it, and that is without me bring up the subject. DB is exactly written for this sort of mess. No one in there right mind will want to leave their family especially when children are still young. If your H is in MLC like mine, take comfort in knowing that he is suffering and hurting more than you do...
All the best
Me: 33 H: 32 T: 10 years M: 2 BD: Aug 2016 H moved out Aug 20, 2016 S: 17 months old