The two of you met, fell in love and started a relationship.
You lived in a fantasy world.
But it didn't last, the fact now is that you are no longer with your love.
Whatever visions you had is now shattered.
Time to face reality now.
In the real world every person is different.
When two people enter a relationship it is necessary for each party to make adjustments to accommodate the other party.
The problem with practically all relationships is that one always expect the partner to be a certain way.
Some people even try to change the other party to fit one's expectations.
A relationship is not about getting what you want.
Most relationships end because one party did not get what he/she wanted.
I would say then there was not much love in the relationship.
A relationship is about love and acceptance.
So are you ready to accept you love as he/she is? When you say you want to have your ex back, do you want your ex to change and become what you wanted so that you can have your ideal relationship? Or do you want your ex back because you truly loved him/her and want to be with your love no matter what? If you truly can accept you ex with all the faults and shortcomings then we can continue.
This is not to say you don't have to change, you partner will accept you unconditionally.
You should try to understand what were the mistakes that caused the breakup.
These are things that you are fully aware but refused to face, or too lazy to bother with.
If you do want your ex back then you will have to do the diagnosis and repair.
By repair I mean you have to change the way you think.
Things that you were critical about you have to resolve it in your mind.
And the things that your ex were critical about you should be faced and a concerted effort to change should be made.