Story: Please, don't leave me. - Harry Styles.

Two best friends.

Totally in love.
Neither of them knows it about each other.

She tells him : "I love you."
First he's in shock, but then he kisses her.

When they're together for a few months, she's feeling not quite good about the whole relationship.

She doesn't want to lose him, as her boyfriend, or her best friend.

But when he cheats on her, she doesn't know what to do anymore.