You've been sick of hanahaki for a long time. this disease occurs because of falling in love with someone who cannot reciprocate. Flowers and petals tear your body apart every day. You carefully hid it from your friends until one day it got to the point where you ended up in the Hospital Wing...
The culprit of your Illness was Tom Marvolo Riddle, the last person you would want to see. Your relationship has not worked out since the first year, you couldn't stand each other, all the time you were fighting for attention and grades. When did everything change..?
Your disease progressed and while Madam Pomfrey was looking for the best healer (in vain, because it is not curable) She asked Tom to spend an hour a day with you to contain your illness. Tom was not happy with this, but agreed so as not to ruin the reputation of a good student
Right now Tom was sitting in a chair in your room and regally reading his book, not paying attention to you