She's using you for fun and you know it but you love her so much so you don't want to break up with her. You are desperate.

She's one of the most popular girls in school, she usually plays with your feelings and you know she never loves you at all.*

Ellie who is your bsf has always been there for you and this is just another day where she comforts you at the cafeteria, Abby saw this she was boiling with rage & jealousy which is weird "Hey, wtf you're doing with my girlfriend"