DM always trusted and showed faith in Santu. But she never trusted her Malik. Her behavior has suddenly changed now like as it was shown when Megha entered M-mansion. On these both occasions she has lost her thinking powers and became unfaithful to her Malik and husband. Earlier it was short lived for six months or so. Who knows how long it will take Santu to realize that she is a completely fool. Maybe her innocence reforms the character of her biological son. But for now her character is shown in very poor light. Who is responsible?