Your current approach towards your ex is completely wrong.
You are currently in a state of grief, frustration and neediness.
You can guarantee that this will never win them back, and you will be caught up in heartbreak forever acting this way.
If you really want things to start turning around, you must change your attitude and revamp your whole strategy to salvaging things with them.
1.
It starts with being confident and less needy...
It is a simple rule of attraction that by nature, we are attracted to confidence and abundance in a mate.
To show that you are full of confidence and have abundance in your life(meaning that you have everything you want right now) Nothing is more attractive than these 2 qualities.
If you can strongly feel these things, the will emanate from you strongly.
2.
Be understanding and accept everything they have to say...
Look, instead of acting worried, frustrated and regretting what happened.
Forgive yourself first for everything you did that you regret doing.
Stop denying the breakup and accept everything as it is.
Once you can put your "guard" down and stop resisting everything they will see that you have reached a point of closure and acceptance.
This is likely to spark a change of heart, and force them to re-examine the situation.
There is a great chance that they will realize the pain of losing you.
This is exactly what you are trying to accomplish because humans are driven by 2 things: pain and pleasure.
If you can get them to experience pain, you have them right where you want them.
3.
Tell them some things you are currently enjoying in your life...
You must indicate some events in your life that are giving you excitement and passion.
Sports, hobbies, social gatherings, projects, dating!.
Even if you don't, show them that you have fulfillment in your life without them.
Infact, this will probably show them that you are doing better without them.
It is likely to make them jealous and feel more needy, and will definitely help get them back!