Its just a dupatta...two in one...Sieve cum dupatta... Even in teej, la made Arnav give some sweet. That didn't count because it was forced. Same applies here. Arnav didn't break it...
She's doing it to attract Kushi's attention... Either, Sheetal is innocent and she's misunderstanding Arnav. Else, she's jealous of Arshi and is weaving a trap for Kushi to fall in.
Though ME was convincing and quite good for the whole week's torture, not having hopes on upcoming week's epi. Kushi to fall in the trap laid by Sheetal or fate. Hope, they bring back ASR and passion with this track and give a decent ending to this track. Don't mind sheetal unless she disrupts Arshi's relationship.