I haven't posted in a while, but I do think that most MLC women do try to come back eventually. Mine did, but she came back before she completed the MLC journey, and I fell for it (and paid for it).
If it matters, my ex-W rarely ever takes her S12, or visits with her D19. Her D19 (my step daughter) still lives with me. I pay for her cell phone, co-signed on her car loan, and help pay for her car insurance. Her mother (my ex-MLC wife), doesn't really help out at all. I can legally cut my SD off from everything, but I won't since I helped raise her since she was 2 yo. I know how hard it is to afford college.
There are rumors floating about that my ex and her OM broke up, or are fighting at the least. He kicked her out of his house so he could rent it out (he took a job out of state...supposedly temporarily). As crazy as this sounds, I hope they get back together/work things out so I don't have to deal with it....or a possible second return.
All I can say is hang in there and live your life. They may come back, and they might not. Chances are, you'll have moved on and won't want them back when the time comes anyhow.