Trauma really settles into you; makes its home in you. A person for whom you made a home in your heart, never actually loved you; rather, it was transactional from the beginning. You filled a need. And as soon as they no longer need you, they burn that home that you made in your heart to the ground.  While making sure to appropriate any valuable material possessions that you may have acquired during your time together (the things you couldn't take with you when they discard you like trash).

Altruism is inherently selfish. Never trust a person who actually gets mad when you suggest that.