If it wasn't...Then Why?

I hope it was a mistake you made
I hope you really didn't want to go

If it wasn't a mistake
Then I'm really baffled
Because I didn't have the slightest clue
Of why you would want to take your life

You never expressed your feelings
You never said you were unhappy
I know you had hard times
And you knew i was always there for you

That's why, big brother
I hope it was a mistake you made