And how is Ganga supposed to know how fond Jagya is of her? She has no clue. He's engaged to Sanchi, he said yes to Shekars for this rishta in front of Ganga's face.
Ganga also grew up without a prince charming...she didn't have a very hunky dory childhood...married at 12, raped, beaten, abused, a maid...was supposed to be tossed into a garbage can once Mannu grew out of his breast feeding age...that makes a person emotionally vulnerable...it makes love a weakness for that person.