IM AT MY BREAKING POINT(!!1HELP ME!!1)?

my past life i have lost many best friends do to them moving and at least being my best friend for 2 -3 years every time. my best friend of recently 10 years just left to new york as of her choice. i don't get why i put so much trust in people just to watch them leave me with out a problem and loose all connections. i can't but help wonder why i should even try to have friends or boy friends for that matter they'll all leave anyways. most of you people will say all people are not the same but its happened every time and every time i think the same thing it wont happen again but it does. i cant trust anyone!!! and this makes it even harder. i don't talk to anyone about how i feel or anything because im afraid they'll think of me differently because of it. and theyll leave and never look back. i dont know what to do anymore. i want to just run away and start over and never look back. anything?? anyone??? i need something??? someone?? help??