I really think vanishing is just about Avoidance 101.
Difficult to know exactly what any individual is most avoiding, but there is a long potential list isn't there? Reality, practical consequences, dealing with other people's feelings or opinions, dealing with their own feelings of guilt or loss or responsibility.
Whatever they are avoiding, the action of vanishing I think just says two things clearly.
That it is easier for them than the alternative.
And that the benefit from their avoidance to them is more important than the damage or difficulty they cause to anyone else.
Horrid, but strangely simple.
It is good when we reach a spot when it becomes less about why they vanish and more about our healthy desire to let go of wanting the insane dysfunction they carry in our lives. I never thought I'd get there but NC is a sane choice for me regardless of why my then h stopped behaving like a sane decent adult. A gift for me and he gets in return the new life he wanted without the irritating responsibility of dealing with the mess he made of his old one much as it saddens me to see what he did and who he evidently is choosing to be now. We both deserved much better. But it is nice to be able to shrug my shoulders and let it be.
T: 18 M: 12 (at BD) No kids.
H diagnosed with severe depression Oct 15. BD May 16. OW since April 16, maybe earlier. Silent vanisher mostly.
Divorced April 18. XH married ow 6 weeks later.
"Option A is not available so I need to kick the s**t out of Option B" Sheryl Sandberg