The doubt

When do we know it`s over?
When you don`t smile any more?
Or when I`m done tryin to make you laugh?

When do we know it`s done?
When you don`t touch my hand?
Or when I wear gloves?

When do we know there`s nothing more?
When you don`t look me in the eyes?
Or when I `m blind?

When do we know we don`t love each other any more?
When you don`t know my details?
Or when I`ve changed them all?

Now I am wondering
How could I have known when it was over
If we never started...