With almost every breakup, one party still wants things to continue the way they are. If you are seeking information to get your ex boyfriend back, in this case it must be you. You want to make him love you again. That might be as easy as reminding him why he fell in love with you in the first place. This does not mean you should call him up and start telling him of all of your good qualities. He probably won't talk to you anyhow.
If the two of you have been arguing and had disagreements lately, you might think that caused your ex boyfriend to want a break. But, it might not be that at all. People in a relationship are bound to have spats and differences, that keeps things from being boring. You might also think he fell out of love with you and wants someone else. You would be partly right. He still loves you, but he also wants someone else. Your ex boyfriend wants the woman he fell in love with.
It is easy to change without noticing it. You might have started letting your appearance slip and that made you unhappy with yourself. When you are unhappy with yourself it makes you snap at others and you stop being the happy confident person he fell in love with. That makes him confused and disillusioned. When men become confused they will need a break to go off by themselves and sort things out. That is what your ex is doing right now.
Instead of badgering him with phone calls, emails and text messages, you should be thinking of yourself and your own needs. Start by looking in a mirror and see how you have changed. Not only on the outside, but the inside as well. Be honest with yourself because you are going to have to make some changes.