For some reasons you have lost the love which was there initially when you first started, and you are now saying, "I want my ex back".
What happened that you did, you could have avoided, that today, you would be enjoying your hard worked relationship.
"I want my ex back", I hear it all the time, and you will continue to hear it, so long as people are living in this world.
What does this tell you? It is not necessarily your fault, and no one is perfect.
Even for those who are still together in love, at one point, some may have gone through the same, or are still going through the same but circumstance may vary with individuals depending on the situation.
Do you then just stay there and do nothing about it or do you move on with life with a positive attitude?.
Here below i have some methods to make your ex fall back in love.

• Assume his/hers non existence:Your ex will expect you to go crying, begging, frustrated,stressed up, depressed and so forth and so on.
  And you know what, you will do none of the above, instead, move on with your life as if he/she never existed.
  Instead, he/she will feel lonely, disliked, unloved and confused.
  The attention she/he used to get from you is no more.
  You will find him/her following you from all corners to make peace with you.
  
• Be more Handsome/Beautiful:When you fell in love the very first time, your ex was attracted by your beauty/handsomeness, how you related with people, working hand, self confidence, calmness, respect towards people, courageous and sensible.
  With time, things change and some you have no control of, like aging.
  However, there are some features you need to maintain, regardless of time.
  Time does not mean that you remain untidy, cannot take a shower, have unkempt hair and stay smart.
  It is human nature that if you are expecting to meet a person for the first time, you may try to look sharp, neat and respectful to create a good impression, while in reality, the reverse is true.
  You cannot hide for too long, truth will finally come out.
  If you still want your ex back, you have to change and be that man/woman who deserve to be loved.
  Try to figure out what you have lost, which you used to do or have when your relationship was excellent.
  Be sociable, consider taking some exciting hobby,etc.
  What does it means? when you broke up, whatever you were doing was not right, and made your ex to leave you.
  Find out from your ex what she/he feels went wrong and take it positively.
  Believe in your self again and be self confident.