Found this - HB had written this earlier in the year:
Once into OW/OM Withdrawal, they are
1. GRIEVING the end/loss of the affair and of the affair partner,
2 processing the SHAME and GUILT of the addiction they'd once felt, that also drove them to what they did, and
3. processing the meaning of the connection they'd forged with the affair partner, even though they know they were wrong, did wrong, and what they did was wrong.
4. They also have to process through the addiction itself to rid themselves of it...
That's why IF they reconnect with the affair partner, the affair will start up again, and OW/OM Withdrawal will end until they make the break once again; then OW/OM Withdrawal will start up from the beginning again, after ALL contact is broken.
What drives them back multiple times is the real sense of responsibility that they are at fault for having dragged this "fine" person into the mess they made..that's why they're often defensive and protective of the affair partner. They feel guilt and shame over knowing they must dump them; but for a time weakness keeps them down.....until they become emotionally ready to break it down completely, and the affair must also become very unsatisfactory to them; they will remain in this status quo.
Anytime you make a emotional connection with someone whether legal or illegal, that person lays claim to a place within your head and heart, when the connection/relationship ends, this is grieved through and processed.
Within the OW/OM Withdrawal, this same connection is also processed through, and broken completely; and the affair person is "purged" from their head, and heart.
They also DO miss the affair partner; more what they did for them, than the actual person themselves, but they have associated and attributed their addictions, highs etc., TO this person, and so they grieve out a whole lot of feelings, various emotions, including dealing with what was within them, whether it was a character fault, or other such issue, that drove them to do what they did, and these are all processed to a final end.
This has to occur and end BEFORE the person who's had the affair will start turning to the one they cheated on again.
For what it's worth, affair partners who are dumped; that didn't wish to be dumped, go through the SAME behaviors of clinging, begging, pleading, and grieving that the LBS goes through when the MLC'er drops the bomb on them expectedly. The difference here is the LBS attains the tools of the journey of a lifetime, whereas the OW/OM who gets dumped, doesn't learn these things, and within a given time, gets into another affair with someone else, repeating the same patterns again, and again, and again.
There are very real problems within men and women who have affairs; and these problems aren't much different than the MLC'ers who get involved with them.
Maybe this will help; this was courtesy of not only what I saw my husband go through, but also, a whole lot of research done some years ago on my part; and nothing has really changed in this aspect, believe it, or not.