Deepak was afraid to confront Sreesanth, Deepak can never say anything on a person's face, he will only talk behind their back. Deepak did not trust Surbhi and passed a judgment about her without knowing the entire story. Even if he though she was wrong, he could have made her understand,
But, he did not wanted housemates to be against him as he wants everyone to like him, such a people pleaser he is.Also, when Salma supported Surbhi, he flipped his side and went against Jasleen, his opinion changes with time.
Surbhi should not trust and forgive Deepak because if he can make fun of her emotions and not be with her in her bad times, then he is a fiend with benefits .
Now please don't tell me that,I am also insecure of Deepak, he is nothing but a double faced person who changes his colours with time.
He is the one who first said to Surbhi about everyone talking about her smoking in the washroom, he added fuel to the fire, so that, there is no peace in the house. He did not inform her because he is a friend and wants to share everything with her, but he did it for his own SADISTIC PLEASURE of diving and ruling.