It does seems to me Shiv has a message he seems to convey before he moves on to the other world. Shiv definitely have intent for contacting or purpose that he still exists in Sharanya's dreams.
There are ghosts, who will not leave a person they deeply love. Persons they still feel strongly responsible for. This may cause them to remain around as a ghost as well.There can be many reasons for Shiv's existence. Waiting for the plot to explore.
Exactly! Shivi is using his limited powers for comunication.
@Red: you mean to say Shiv might be helding her responsible for his death? 😲 I think the inteeqam part in his shayari relates to pain in love then death 🤔