What broke my heart the most

Behind all these walls
That I built long ago
To keep the pain out
So I wouldn't fall

My heart beats for you
I just thought you should know
When I see your face
I don't want you to go

I want you to see
Exactly what I feel
All the thoughts that I hide
All the love that is real

I know it's hard to see
But I do love you so
And what broke my heart the most
Was that I let you go