fear of losing someone you don't even have

not that we, humans, ever technically own anyone but having somewhat of a "claim" on people. i don't care what anyone says i know that we've all been afraid of losing people we don't even have. we all probably worry about that everyday. we're afraid of losing the ones we don't have because it's so easy to lose the ones we do have. it's so easy for that person to just leave, leave without even saying anything. and when you try to keep contact it's like they don't even care. how much is caring too much without being a bother.