What Does it Show?

I need a bit of help.
Tell me what it shows,
When you're talking to someone over the phone,
And you forget that someone is there
And you only talk to yourself,
Perhaps, perhaps in despair.

You repeat words.
You repeat phrases.
On and on, over and over-
"Two years Two years", "no-no no-no"
On and on they go
"Ok Ok Ok Ok" soon follow.

Someone's talking.
Perhaps you hear, perhaps you don't.
You go on with your chant,
For a semi-hour or so.
What does it mean?
Or what does it show?