Tanisha is so insecure

http://colors.in.com/in/biggboss/videos/you-have-no-time-for-me-day-89-sneak-peek-3-51248-14.html#nav

Why tanisha is so insecure with Kushal and Gauhar? I never undersand why Salmaan never ask this question to her.
She has so much grudge against Gauhar which makes me dislike her even more.