The lack of understanding between men and women on how their thought processes differ is the major reason why so many men and women fall out in between of a great relationship. There are so many examples where men have dumped women simply because they found them to be too nagging and that they were finally irritated with the complaints that the woman had with regards to everything.
You need to understand that men do not like women complaining too much and that does not include them alone but about everything. Hence, this aspect is what you may just have to change in order to understand men and find out how to get your ex boyfriend back. There are many websites that shall help you on this journey but before you can get him back please do understand that men are not from the same planet as you are. They are from Mars and you are from Venus as the popular book goes.