Ragini and vampness

I understand why Ragini wanted to destroy Swalak. She loved Laksh very much, rather obsessively may be thats why she chose Lakshya over her sister and family. But what about Swasan?Why do Ragini want to destroy swasan relationship?This is clearly confusing to me. Just for the sake of TRP and necessity of a vamp in the show cvs are destroying the logic and moreover essence of Raginis character.