It hurts the most when.....

It hurts the most when you turn your back,
When you walk away and don't look back,
It hurts the most when you don't say a word,
When the expression on your face speaks louder then your words,
It hurts the most when you don't tell me what you feel at all,
When you keep building castles and I keep breaking down the walls,
It hurts the most when you don't do anything at all,
When you won't let me in we get nowhere at all.