Really revenge for what because he is broken really or he is breaking a girl who lives in her own lalalaland 
He knew she came as spy in his life he tried many times to catch her red handed but failed through Mrs desoza and sunny he knew she was telling lie that she hadn't any one in her life he clearly seen ring mark and trust if he ever did even for a second
*After first shootout when she told him about yg did he believe? When she took Ishani's name did he believe?mrs desuza killed and he believed on reports the person who was living in front of hiseyes from many years and he didn't know about her mental state great
2- And now I come to Kabir point ridhima loved Kabir and you loved ragini Kabir send ridhima to destroy you and ap sent ragini to destroy you if you can fell in love with a girl who came in your life for money why can't ridhima more than you who can understand the pain of used as a pawn to get something but you are taking revenge
3- before falling Kabir told you that ridhima handed him all the proofs I understood you believed because you had seen the cctv footage and you heard the audio of ridhima confessing she is a spy but what did you learn to become Vihaan no one knows but you knows that Kabir wants to kill ridhima to frame ridhima to throw her out you himself seen their Tasha and most important you had seen how he manipulate things in his favour
You yourself knows now ridhima loves you more than anyone and now what you want she should go in her past and erase Kabir's chapter from her life
Cheating ki baat kare ap cheated you most she pretended you she loved you from many years but she was ruining you but what you did with her nothing if she looked after you then ridhima too saved your life
And most important you brought a girl to torture your wife wow great
During marriage days ridhima was totally rude with him in their first morning after marriage how she reacted when he tried to tie her Dori
She bluntly said you that she will send you jail you knew she hate you she was working for someone she only thing you didn't know that her partner in crime was her lover and ridhima she wants and sees things how she wants to see lives in her own lalalaland without giving any heed to her self respect
If we love someone truly first our all the rules change for that person
I am very poor in words but that is what I feel