"I didn't know she/he was depressed"."Never told me anything!"
"How can a smiling face can commit something like this!"
Well they didn't know the part of your story.How lonely you had started feeling lately.How detached you used to feel from the happy crowd.

And it didn't happen suddenly in one day.At the beginning,you tried to brush it off.You listened to songs, you tried to pamper yourself.
You thought you are going to be okay.
Until one...