There is no magic bullet when it comes to these things and people who proclaim to have a secret to success most of the time are just blowing hot air. Your best chance if you want your ex back is to meet up and have a conversation with him, see if he is interested in another go or not. Any "tricks" and "magic bullets" will likely leave you disappointed with the outcome.
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~