Jackson, Isaac, Lydia | It was your fault! [AU]

WATCH IN HD, PLEASE!!! --- Please don’t mention the character names, and the song name and the show name in the comments, you can use initials for the names, please and thank you. Storyline: S has a huge crush on L, and he’s pretty sure that jackson is cheating on her with isaac. So S has a plan to investigate if it’s true or not. Once he finds out, he goes to tell L, but she doesn’t believe it and gets mad at S. But one day she sees j&i kissing at a club and she’s heartbroken, even though at this point ja