Deva and Tara's revenge and love saga had reached to its bottom line now
The hug was a trigger, Chachi, on the other hand fueled his already wounded heart. Deva thought it was a cheating, He thought She has replaced him. This is the outcome of the vaccum and the long pined wait. No matter how sacrificing Tara 's move
looks, Deva thinks that she did it all for her own selfish agenda and to help her toxic family. If he would have heard the same confession,the night they were locked, in freezer, he would have forgiven her, But after that he for once tried to set aside his revenge and tried to give a chance to his feelings, but that hug, that brainwashing chachi did create more damage,as if he is befooling himself. This angered him more. Deva wants a blissful, soft and happy conjugal life, but the revenge and the burnt scars is not letting him to do so. This is irking him more. He is too focussed to his revenge and at some points, he is compromising his morals. His dimension is of revenge for the first time took a wrong route,It is not good for him.
The kind of person he is, it ultimately would add more scars to his untreated wound. Tara is way more stronger than him. He will be sad and unhappy only causing pain to her
Tara broke his trust over friendship, he could actually sent her jail framing her in a false case. She never cheated him over love, So what he did bringing an other woman and banged the door over her face was not right. Deva did something what is opposite his character and this trp things always tend to butcher the essence of the character.