What is the word used for the person who Hurts you?
To explain my question, I'm using one quote:
You see a person's true colors when you are no longer beneficial in
their life.
It seems to me that such a person is selfish or narcissistic.
selfish: devoted to or
caring only for oneself; concerned primarily with one's own interests,
benefits, welfare, etc., regardless of others
narcissistic:
refers to someone intensely concerned with only his or her own self or
interests and who seems to forget that others exist
When you are "no longer beneficial in their life", such a person moves on without a care in the world, because the only thing that matters to them is them. What "Hurts" is that you care, but they don't.
Being selfish or narcissistic is not the same as being a user or an exploiter, each of which implies intentionality. People who are selfish or narcissistic are so self-absorbed that they use and exploit without even realizing it. It's always all about them. They're not parasites either: parasites at least know they're parasites.
If you're seeking a less commonly used word, narcissistic fits the bill.