Everhopeful - I am very used to this cycling - been at it a long time. We never see each other. I haven't laid eyes on him in over a year [except in court]. I too have have experienced the 'major breakup' in my case, back in late 2006, which like yours, lasted about 3 months. And you are right, they get sucked back in, until they start to wake up.
The r with OW is now very slight for a variety of reasons. I do know this for a fact. In my case I am very far from sure if I even want a friendship. A lot of damage which I do not think my xh will ever deal with. But it is better that we can exchange an occasional email and be polite to each other. A huge advance in my case!!
I know that a lot of MLC behaviour comes from their huge sense of inadequacy. Coming home is very hard for them until they have worked through their issues, and as I have said, little expectation that my xh will ever be in a place to address his issues. He has been reaching out to his children recently, and saw his eldest son after 4 years, but my son reported that he still doesn't really get it. They are damaged goods.