There is a simple reason why a woman might say that: she wants to move on and feel totally free.
She wants as well to make her point that there is no way she'll get back with you.
She simply exaggerates to stress this fact.
When you step out of a relationship, the past might feel like a dream. When you are out of the context, it can be difficult to recall emotions and feelings.
The love you shared was real no matter what she says.
The moments you had together were valuable for you and her at that time.
Again, the only reason she says these things is because she wants to create space in her mind and life so that she can start over.
It comes from a natural need to free herself from any regret which could hold her back.
To your power!