If we consider real life - people may be friendly with their ex but they do not meet so frequently. In real life ex-husband/wife can be in a platonic relationship after break-up, but it is difficult to imagine that they will never remember the time spent together in a romantic way. Jealously towards the current partner of ex may also be present and the current partner may also not be comfortable with the ex around.
Anandi- Jagya relationship is complex and too unrealistic. The forum justifies their relationship as childhood friends - but neither Anandi nor Jagya ever mentioned each-other as friends. (when Anandi recalled Jagya's story in school - what stopped her to say it is story of her childhood friend if she actually considers him as friend - she said "mere kisi khaas ki kahani" , so Jagya is someone special to her, not a friend). But their relationship is platonic after the break-up (that is why the mud-slinging was disgusting). Even Shiv and Ganga are out of this world in understanding in this regard.
I agree with some other members that the serial has always shown something else and preached some other gyan. I quote here what @ atominis wrote-
There is not a single instance in BV in which men-women were simply friends, colleagues, mentor-mentee without being romantically linked or doubted to have a liason.
Worst example of this kind was Jagya-Ganga where till the last time it was said that he is just helping her. In the end when the marriage happened - it looked like the 'help' was just to make her eligible to be haveli bahu.
Let us wait what relationship Anandi and Jagya give for each-other to their children - Mannu will remain like this - started going to school, but cannot speak full sentence, but Amol is older - whether he calls Jagya as mama is to be seen.