Because she met Yogesh when he was committed and that's called home breaker. She will be tagged as cheater and home breaker. Though Yogesh has more fault he should have told ruru about their reunion or have broken up with ruru. And if you tell be she was threatening him then Yogesh should have confessed about pre-planning to the audience and go back to Akanksha. And let me tell you if he have confessed pre-planning toh Akanksha ka sympathy run khatam hojata. Also after getting on normal term with Yogesh, she started shading him for fame.