I am having the same issue lately, so I will share with you my analysis/theories.

1) These types expect too much of everyone surrounding them/closest to them, and nothing of themselves. They expect others to fill them but do not understand no one can do that but yourself.

2) Attention seeking behavior, any attention is good attention.

3) No respect for themselves, so no respect for others around them. Ego-centric type of thing. I suppose this can relate to number 1. Leaving them in their own close minded place. Everything happens to them and no one else.

I am not sure if any of this helps, because I myself am trying to figure things out. These are things I have come up with. Hope this helps at all. I am listening to myself, and my needs. Its important to feel safe, and give yourself the strength to cut them out. No matter the circumstance. Sometimes, you just have to put you first.

Hope you're okay.