I’m not convinced that the psychopath does not want interpersonal relationships, but I am convinced that the psychopath grows tired of the steps needed to create and/or maintain those relationships. I believe this sentiment is summed up best by this finely worded forum post by one of the moderators:
I want a cactus. But instead I end up getting some needy little sunflower and I put it in the shade because I only want to look at it on occasion. Then one day I go to admire my flower and it’s dead. I neglect them. I only want to see them on my terms.
I’ve often used a similar analogy to describe my stance on interpersonal relationships. I really, really do want some semblance of an interpersonal relationship, but I am a perpetual loner because I have zero desire to grow and maintain those relationships. I want to be surrounded by potted plants; plants that require the most minimal of care and are always available on my terms.