Why is jealousy among women unpardonable and a sign of faith in men?

While hunting for reference to the narration mentioned here I stumbled upon this quote by Imam Ali(s.a.) in Nahj al-Balagha : > Jealousy in woman is unpardonable but in man it is a sign of his faith > in religion (because Islam has permitted polygamy and prohibited > polyandry). I fail to comprehend the following thing in regards to *jealousy*: 1. why is it unpardonable for women? 2. conversely, why is it a sign of faith in religion for men? 3. what has 1. and 2. got to do with the permission and prohibition of polygamy and polyandry respectively in Islam?