Thanks Amaranth. I'm glad it helped.
Marie Kondo has a version of this that's a little more simplistic: keep what sparks joy. In other words, don't hoard stuff you don't really want just because you've paid for it. Not only is the spent money already gone, but the material things you keep in your life have ongoing maintainence costs.
When it comes to people, you should get out what you put in... . And when the person you're with shows you that they're not capable of making deposits anymore, they should not be able to continue to withdraw from the bank of YOU.