After they've divulged in personal matters towards you for some unknown reason (telling you about their past and their relationships and their trust issues, as if you could care?) How do you tell them you in actuality do not like them as a person, you are sick of their constant persecuting personality towards you and inconsistent moods,*and you would prefer to place yourself around people that don't persecute you for being who you are, people that accept and encourage you instead of the opposite? And that you were only interested in their "personal matter" (that they felt obliged to tell you) from a detached mental point of view. That you prefer to be around people that aren't afraid to be who they are, putting on a front even if it serves as a disservice towards them, you never cared about them. your interest in them was just as fleeting and comparable as a cold windy winter day, and you can't understand where they would ever develop feelings for someone that never displayed romantic feelings for them?