Hi - what beingme was saying was all true - it is worth remembering that people in MLC behave like narcissists. I am not sure whether they are essentially narcissistic or whether it is a response to the stress they are under. The therapist I saw thinks they are borderline . . .
As to whether they are a figment of our imagination - hmmm actually I don't think they are, but I am not sure they were always what they were appearing or being to us. These people are, I now realised, very masked.
I think the narcissism is why they walk away so easily - some say they already left the marriage a long time before. Not so sure about that. They were unhappy and blamed us and thus found is 'easy' to leave, but honestly, I think my sh was married to me until he wasn't. I can pinpoint a three month period in which his whole personality changed and I noticed it immediately