Why let her in?

Why do I let her in??
Share my life and my dreams
My hopes and my fears
Here I think we are growing but in reality we are just talking

Just when I opened up my heart
Your old flame came back
And you ran to him like a little school girl
It ripped my heart apart

All that I thought we had was really not there
Except in my mind,
A false reality- a virtual paradise
Constructed from my thoughts and feelings for you

Why do I let them in?
Why share those things that make you-you
For one good simple reason--
The next time you do, she might be the one for you