Depressed?

"So why are you so depressed lately?"
"Wha- what? Really?"
"Yea. Especially on Monday."

Thoughts started to flood his brain.
Am I really depressed?
Down, yes. But depressed? With exams, assignments and problems, it won't be a big surprise if it was true.
Even if he was depressed, he kept it hidden deep down; he kept it hidden with a mask of expressions. He never thought anyone would predict or even discover. But now that his friend came up with it, it struck his mind.

"You know, you could consider being a psychologist too if this doesn't work out."
"Haha. So, you were depressed right?"

He paused for a moment.
"Well... I was.. on Monday..."