Because when you say things like:
- He was perfect
- He was the one
- We were so good together
- I never met anyone like him
You forget an essential point:
HE DUMPED YOU!
How perfect is that???
Here is another good one:
When you say that you never met anyone like him, my question is:
How many men did you actually meet?
How many men are there on this planet?
Are you sure he is that unique?
He might be unique to you but I can guarantee you that the moment you start searching, you might be amazed of the amount of quality men who are ready to date you.
If you are afraid of not being good enough, then do something about it.
Change what you don't like!
Build up feminine power!
Become a better person!
When you glorify him, you forget about the dark side, and the hard times.
You forget about a whole part of your story which might have involved pain, frustration, fights, endless tensions and so on.
Besides, puting him down consciously in your mind actually shifts your perception of balance of power between the two of you.
It gives you back trust and confidence.
Dig in and make a mental list of all his negatives!
In many cases it will make you feel 100 times better + You will realize that he was not that ideal after all...