Speaking to Inside Soap, the actress declared that her married alter ego has turned "slightly psycho" since her affair started with the taxi driver and gambling addict.
However, Gulati admitted that she is unclear on the direction of her character, declaring: "She has her own agenda, but I'm not sure what it is yet. I know she does like having the power and control."
The 45-year-old went on to insist that Sunita "does still love" husband Dev (Jimmi Harkishin) despite her recent troubles.
Of her on-screen romance with John Michie (Karl), she added: "I think the blokes always see an affair from a trouser perspective. Sunita sees it from all sides, and the more time she spends with Karl, the more she feels there must be something deeper between them.
"That's the nature of being a woman in these circumstances - I think she's actually fallen in love with him in some way. But she's not getting anything remotely like that back."
Sunita and Karl's affair is spotted by Sophie Webster (Brooke Vincent) next week, leading to the pair becoming pressured to keep their relationship secret from Dev and Stella (Michelle Collins).