I think Ell is just more mature than syd, friends fall out all the time but Syd is acting like a high school little girl retweeting quotes and constantly trying to prove she’s so happy and having so much fun with other friends. Syd is an attention seeker and from experience they are the worst people to be ‘best friends’ with as they just can’t stand to have anyone else look better than them, do better then them or have more friends than them etc maybe Ell has just finally had enough of it all