Being left in the lurch or being "dumped" is very damaging to a person in terms of self-esteem not to mention the devastation made in terms of a broken heart! A person in the throes of a breakup is likely to do immature and illogical things.
What are the mistakes that you should avoid to get your ex back? Begging for reconciliation - is a NO! Please have the decency to respect yourself! If you go about stalking your ex and asking him or her to take you back, you just lost your chance to win your ex back.
Stop calling your ex and sending him or her pathetic little notes written to evoke pity.
Keep it fair - Do not play dirty tricks.
Do not even think of telling your friends or our ex's friends about his shortcomings and humiliating stories about your ex.
You might feel a little and justified but your ex will definitely not even look your way if you do this.
Do not hound your ex - Do not stalk or pursue your ex.
The breakup happened because your ex wanted to get away from you for a reason.
Let your ex find himself or herself first.
Stop calling and leaving your ex messages in his/her emails and text.
If you can help it, do not even check the status of your ex's social sites.
Leave your ex alone for him/her to miss you.
Do not mock - ...
or taunt your ex in case you bump into each other.
Doing this is one sure way of shooing your ex away forever.
The best thing that you can do is to just keep quiet and let time heal all wounds.
Your ex will eventually call you if only to say "hi".
When that happens, it would be all up to you.