Got the same problem with my ex, she was nice but always looking for something better, girls nowadays can't commit to a relationship, they have access to too many guys (most of them are liars and will do anything to sleep with them). Girls just keep looking for a better option, till after a big while they find out there is no better option, they try to go back to the best guy they had, but that guy also has too many options now. It's endless.