You are right. A darkworker's relationships tend to revolve around validation and fear of being alone. But then when you take it far enough the two paths tend to converge.
A lightworker would be in an intimate relationship so they could express love.
A darkworker would express love in order to be in an intimate relationship. Often what becomes good for the darkworker becomes good for all.
As a darkworker you can be fully true to yourself and get the relationship *you* really want, cutting away those leaches that won't help you out at all. To have that relationship you probably will have to be loving and caring to the person that gives you what you want. Win-win situations and mutual gain are still good goals for a darkworker.
As a darkworker a person will be self centred, but it doesn't mean they have to be selfish, even though many people confuse the two.
I hope this helps you out.
ps. I tend to polarise to the light side, so this is my view from the outside.