Just don't do what so many people do after a break up and be so desperate to get the love of your life back that you make a complete and utter pest of yourself by constantly trying to contact your ex.
Your ex will find this so annoying, especially since he/she is still very hurt and equally as angry with you.
Your constant calling will only make your ex more annoyed with you, so stop doing this immediately.
As difficult as it is, you have to accept that you and your ex have ended the relationship, and if you want to get the love of your life back at some point, then you have to do things the right way.
Making contact with your ex right now is definitely NOT the right thing to do, so just scrap it.
What you must do though, is take a deep breath and relax.
Tell yourself that whether you like it or not, you are single again, and you might as well make the most of it.
There will come a time when you have an opportunity to get the love of your life back, but for now you are on your own.
So, what to do next? Simple really - just get on with your life as you used to do before the relationship.
There are probably many things that you just gave up doing when you and your ex were together, so get those things up and running again.
You obviously enjoyed doing them then, so do them again.
Another thing, try to avoid the urge to find out where your ex will be so that you can "bump" into him/her - your ex probably knows this tactic by now, and will not be at all impressed.
Just leave your ex alone entirely - let him/her get on with his/her own life, and you get on with yours.
If you and your ex were meant to be together then you will get the love of your life back at some time in the future - it will happen naturally.
If you are unavailable to your ex for a long time, then who knows - your ex might miss you so much that he/she will make contact with you and suggest that you go for coffee and a chat somewhere.