OK, I just thought of something. Have you ever seen the movie "Let Me In"?
Its about a vampire (they don't age so she is perpetually a little girl (though there are hints in the movie that she might have once been male)). She "attaches" an enabler who goes out and murders victims to feed her with their blood. I think they are a guardian or something. Once they grow up and get old, she moves on to a younger guardian.
That sounds like your STBXW. Using someone until they no longer suit her purposes. As you've said, OM's day is coming..........
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018
