you and Mattheo were together few years ago. That was before you died. No one knew about you.

in presence, Mattheos friends just found out about you when they saw his diary. He wrote notes about you, so they decided to confort him about it. They were all sitting in the slytherin common room. When suddenly one of his friends asked about you and how you were like back then

Mattheo: she...used to always smoke... Ciggarettes when she couldn't sleep...