Even though it is your ex who has dumped you, you are keen to get your ex back.
 You've tried hard to use all possible tactics so that they return to you but so far you have not been successful.
  Using the right tactics will probably help your ex return to you of their own accord rather than you keep pursuing them to do so.
  Keep away from sight of your ex.
If you suddenly disappear from the scene your ex will wonder what has happened to you and where you are and will make an effort to find out.
They will then try to return to you soon.
  Let your ex not know anything about your whereabouts and what you are doing or where are you so that the anxiety to find out will be strong.
Let your ex feel that you are not interested in them any more.
Let them feel dumped now.
  Do not contact your ex.
Do not make any effort to get in touch with or contact your ex either on the phone or in person.
Do not also make any attempt to contact your ex through any of your friends or relatives.
  Keep them guessing now as to why you are not contacting them.
Let them miss your phone calls and enquiries.
  Show you're very busy.
Your ex may try to contact you or try to meet up with you.
It is your time now show that you are very busy and have no time for them.
You should also not respond to the phone calls they make to you.
  Do not respond to the calls and do not call later either in response to the many calls they have made you.
  When your ex sees this change in you they are sure to get back to you even though they dumped you.