Tina was checking from the start with whom she could partner up with and play the game. And she really tried everywhere, mainly with the guys. And she choose Shaleen.
I think it is Tina who from the start threw seeds in housemates minds and in ours that Sumbul is blindly in love with Shaleen. She emphasized it in every conversation with him. She (and Shaleen too of course) could have easily taken Sumbul aside and just say to her what she thinks she is seeing. She says she speaks bluntly on the face, but only when it suits her. And she too needed Sumbul as extra support.
Tina wants to be his or someone's only priority and she had expected it to be like that already. There was no need for her to yell at Sumbul in the bedroom. Sumbul is just being Sumbul when it comes to Shaleen. Tina thinks that only she knows how to handle Shaleen. Meaning... She needs to make sure Shaleen is still eating from her hand..
The way she was giving him the vibes that something is there between them and then when being questioned about it, she would say no 0.0% from my side being only worried for Tina the Brand.
It is good to worry for your good name. She worked hard for it. But don't play with others emotions. And Shaleen (whom I am no fan of too) but got himself played and he knows it! And he fall in her trap again. These people are on a constant loop.