Crushes and crushed hearts~ A Miraculous ladybug fanfiction (editing currently)

Adrien/ Chat loves ladybug but thinks of Marinette as a friend. Marinette likes Adrien, but gives up her feelings, deciding that Adrien would not fall for her. Soon, a new boy moves from London to Paris. He falls for Marinette. But when Marinette soon begins to fall for the new boy in class, Adrien gets unexpected feelings...

What could this mean?

(I started writing this as what I'd assume was either 7th or 8th grade. I'm gonna see if I can improve the writing, so it's gonna take a while.)