the day you met Cedric Diggory x reader)

you were on the train ready to go to Hogwarts for the first time as you were the first year when you met a boy non-other than Cedric Diggory he was also a first year at the time and asked to sit next to you on the train as all the other compartments were full but what happens when you two are best friends and he starts to date girls your jealousy rises and then what. and what happens when you catch feelings and he dosen't