All three JW, BW & TS destroyed the person they love the most unknowingly/ unwillingly.
Bani by trustin her repto sister has put her husband who she loves the most through hell. He had a perfect life. A wife who accepted him back . He was awaiting birth of kids he longed for his whole life. Only his wife with her inocent nature, love for her sister & jasoosi destoyed it. I am not blaming her but Pia was cunning to take the hintof opportunity when she came to know about Bani helpng her inspite of what Pia did to her.
Tarun's love for Bani made Karuna join hands with the devil dou. If only he didn't repeat the chant of loving someone while agreeing to marry Lakshmi. (though I don't get what was bnai's fault if TS loved her. She tried her best to get Tarun & Lakshmi together. What made Karuna go against her. SHe talks about bani being ungreatful what about herself. Didn't she think about JW)
Bani had warned Tarun against giving the camera for repairs. Tarun whille tryin g to help Bani gavePia ultimate weapon to destroy Bani. The women he loves the most.
That's a big trgedy especially for JB. Both are in so much in love with each other. But can't be together because of Pia ( rather Ekta maayi)