To me she is one confused soul.
Vikram matters a lot to her and can't go away from him. At the same time, she can't accept Vikram because that will make her stamp as a "home breaker" in her own conscience.
In her sub-concious mind, Vikram is very much there in her life but she don't want to be a part of Vikram's life. She want Vikram to ignore her and move on with his life (if it is with Reva then it's even better). Vikram knows this fact in his sub-concious mind and want to prove it. So, he is playing all weird which was not expected by Sugni to get back at her and prove his point.
This is my interpretation...
More confusion is yet to come in the story.