In my opinion, the fact that MLC takes time is one of, if not the, most important thing to keep in mind for the LBS. It ranks right up there with not showing anger toward the MLCer.
My friend's situation has shown me clearly that MLC does follow a process.....and it almost always passes, but it takes lots of time. My friend did a good job of detaching. He RARELY contacted her, and did not initiate any contact after she married the other man.
Over the past 3 months, SHE has been the one in pursuit (yes, while still married to OM, ...and no, he doesn't know she's thinking of divorce) I am reminded of Jim and Sally Conway's book "Women in Midlife Crisis" where it talks about a simplified 3 part process of MLC. In part 1, denial and anger are present and tension begins to build. Part 2 is the dramatic part, which includes all the "running away" things like OM/OW and possible divorce, and in part 3, he talks about a GRADUAL return very similar to their old values and beliefs.