Ananya is not a doormat or Antara 2.0 as she showed courage to go away from Rudra, her reactions are completely normal at least for me, she was jilted and Rudra didn't even care to call off the wedding, she had to go and inform everyone that Rudra has left. A different man, a good human being, I am not even going to long history of friendship between them, anyone would at least have taken the responsibility of breaking this marriage and saving Ananya from the humiliation, Rudra couldn't even do that for her. Ananya was left alone to face everyone, her family and her friends, colleagues from RuAn who attended their wedding ceremony.
Rudra didn't love her, but she never expected love, Rudra promised a good marriage life to Ananya, he promised respect and fidelity, Love was never a base of this marriage that's how most Indians get married and they have a successful marriage based on trust and respect. It was Rudra who asked Ananya to marry him. I liked Rudra and Ananya's friendship before Rudra asked her to marry him because his reasons to marry Ananya was clearly using her love for him, he knew Ananya won't say no to him, he had kissed Maya and was afraid of loving and breaking Maya, instead he decided to break Ananya, Friendship?
In this, Rudra is happily married to love of his life, the only one hurt here is Ananya, she has every right to hurt Rudra as he is the reason for her pain, that's how human react, people don't go back to being friends like this.
Ananya was leaving, Rudra's father asked her to stay, she doesn't visit their home, Ananya has stayed in office only where Rudra was insensitive enough to boast about his happy married life in front of the woman whom he left at the alter, in front of people who were probably invited to their wedding. Any woman would feel humiliated in this condition as she was rejected on her wedding day.