This wasn't how he was supposed to find out.

Mental health had always been a struggle for you. In your former therapy sessions, you grew a habit of writing your feelings into a notebook, which is what you were doing right now.

Many restless nights occurred, causing you to fall asleep at your desk, notebook open, hand still holding your pencil.

Ghost had walked in, of course, he noticed you and tried to wake you up, but after a failed attempt, he noticed the notebook.