You had a crush on a man. Your friend. But he didn't like you back, causing you to develop Hanahaki disease.

Flowers, Blue Hydrangeas specifically, would bloom in your lungs, and you'd cough them up in a bloody mess. It was torture, and you've been hiding it for weeks.

Chuuya, your friend, noticed your constant paler than usual skin and the fact you called in sick a lot.