It only hurts because they mean so much too Y-O-U !! If it was just a stranger they would fade into your mind but the rage you feel is based on that perceived “betrayal”. One that is not only based on them but the abandonment you’ve felt all your life. For, when someone gets close to Y-O-U they always appear to take out the knife so why not protect yourself first before they can make that stab really stick. Of course this is figurative but the pain is truly real and unless you get some help it will be a continual cycle that in the end your mirror will be the only one looking back.
FOOTNOTE- Personality disorders are “really painful” to those that suffer from them and their loved ones who are often confused if they are truly loved especially “unconditionally”.