Brilliant post - thanks for sharing
I think its Sharons insecurities that are making her be cold with Swayam.
She feels let down by him.
Its hard for her to open up and when she did put herself forward in the relationship and tried to change ,We saw a different side to her ,someone who was willing to make this relationship work.So much that she decided to change herself,which is very unlike Sharon
And that one moment when swayam let her down in her mind
She backtracked to shutting away form him.Because she was hurt which she didnt want to admit.She decided that the way to not get hurt is not get affected or put yourself all the way in the relationship.