regarding the idea of "im not worth it" , this is a typical reaction used by many when they don't feel the same way towards the other person! they start telling you they are not worth it, mainly because they don't know what else to say, and because its much easier than other answers such as "sorry but i dont love you" ...
and crying is not bad! its an honest and innocent way of expressing your feelings! which is very normal in your case. but don't spend the whole day/night crying! here it starts to become a bit problematic.