He went against him in Samudre Lootere and took his name for jail whereas eh was equally involved in torturing everyone, Nirmal said that infornt of him and I always used to wonder why is Romil not realizing Deepak's true colours.
Deepak was trying to play both sides and was giving false promises to Romil that, he will be always there for him.
Deepak always broke the trust of Urvashi and Romil, but Urvashi realized it on the nomination day itself, this Deepak always makes a mudda against Jasleen not sacrificing anything during nomination, we have seen how much he has sacrificed for Urvashi, he never even helped her being a captain once.
Also, he was not happy when Romil came again in the house after Nirmal got eliminated, I saw that jealousy look on him that day itself.
H eis so concerned about what Romil is saying and makes a mudda out of everything he does these days, only Deepak's emotions are genuine and the rest of them are fake , only he ahs the right to cry and receive sympathy form everyone.