Fear of loss is something used by highly experienced salesmen and it's also something that you can use to great and powerful effect when trying to get your ex back.
The fear of loss is exactly what it says - Fear of losing out.
Salesman often use it as a way of selling something, "If you don't buy this now you could miss out on our special discount", or "If you don't get this now we could run out of stock and you'll never be able to get another one".
People can't stand to think that they might end up without something and later live to regret it.
So, if you want to get your ex back then try using the fear of loss.
It can be extremely powerful.
Make them realise what they are missing out on by thinking about what you provide to the relationship, make your ex consider where they will be without you and how much better life is with you.
Now beware - Don't go down the route of getting into arguments saying that your ex is nothing without you and it's you who puts the food on the table, that's not what this is about.
Going down the route of "placing the blame" is the worst thing you can do if you want to get your ex back.
It will only result in you pushing your ex further away and making them think that they have made the right decision all along.
No matter how tempted you are to get views off your chest and blame your ex you must try and swallow it, forget it and move on.
Make sure you truly get it out of your system as it doesn't matter if you bring it up now or 6 months after you get your ex back, the fact remains that bringing it all back up will result in you rocking the boat and putting the relationship back at risk.
You need to prove to your ex the love, support and security that you provide them.
The fear of loss needs to be used in conjunction with no contact for at least the first month after the break up.
There can't be a fear of loss if you're always there! Remember that! If you want to get your ex back they have to have a true taste of what they could be missing out on and what they might lose and the only way you can do that is to take away contact with you so they can realise what life really is like without you and hopefully how much difference you do make to their life.
Getting your ex back should then be much, much easier.