Pain and anger are the only things you and your ex have in common right now.
During your relationship you respected each other enough to do things in a way that would keep each other happy.
It is no different now.
Respect each other's feelings right now, and give each other the time you both need to heal.
Only when this has happened can you get your ex back and be happy again.
When you were still together, there were probably times when you just wanted to be alone, even though you loved your partner dearly.
At these times, your ex did what you wanted, because he/she knew that this would make you happy.
Take this same attitude in the situation you're in right now, and you will probably get your ex back.
Just leave your ex alone as you did before, and do the things that you used to do then.
Read, go out with your friends, go and see a movie, anything to pass the time.
Whatever it was though, was enjoyable - so make sure that what you do now has the same effect on you.
What you are doing now is giving both you and your ex time to heal the pain and anger after the break up.
When you are feeling a lot more positive about life, and your emotions have simmered down, then make contact with your ex.
Apologize for making him/her unhappy and say that you would like the opportunity to fix the problem you have caused.
This is your first step to get your ex back.
If your ex is willing to talk to you, sit down and quietly talk things over in a relaxed way.
Talk about your part in the break up and what you are willing to do to fix this.
It is very likely that your willingness to admit to your mistakes will encourage your ex to do the same.
Once your problems are solved, the mutual respect will return, and you will go all out to make each other happy again.
Sooner or later the break up will be a thing of the past and you will get your ex back.
The trick now though, is to learn from your mistakes and do all you can to not let it happen again.