So, your ex found someone else and left you? You're hurt but you'd still do almost anything to get your ex back.
You simply miss the good old days spent with her/him and find yourself being haunted by the all sweet memories! Yes, it hurts...
your ego and your self-confidence are completely shattered now.
You feel lonely but you don't really feel like talking to anyone.
You keep on trying to fall asleep but you fail.
And when you occasionally do...
you usually dream about your ex.
You cannot concentrate on anything.
All you can think about is how to get your ex back.
Well, you have to trust your love and trust yourself, and just believe that you can get your ex back, even if she/he is with somebody else.
Just remember...
you don't have to worry or hurry! In any case, your foremost tip is not to show her/him your desperation, frustration or despair.
Try to avoid them if you can for a while.
Make them realize how undisturbed you are and how wonderful and normal your life still is.
No matter how much you miss your ex, you are not supposed to make phone calls or send text messages to her/him.
It's not the best time to be sentimental.
It's time for some action.
Instead of wasting your time on making pointless contact attempts, focus on trying to actually get your ex back.
Look for the reasons that made your ex move to someone else.
What were your shortcomings? What does she/he want to see in their partner? If you know...
what are the good qualities of their new partner? Try to get over the habits your ex didn't like and work on the aspects she/he appreciates and is attracted to.