sorry to say bro ,but there must be something wrong in you,the way i saw ,this thing has happened to you several times rite?
so take some time and think what wrongs you have done in past thet led those relationships in to breakups.Or maybe you have choosen the wrong girl everytime.brother dont trust a girl until you are 100%.if there is a girl who is trustworthy you can trust her on ur life.otherwise never ever.(no offence)but dont think that you are miserable.
try to find a new fish!!