Valmiki Ramayana Ayodhya Kanda Sarga 39 Shloka 21

पुरा earlier, सुखम् pleasures, अनुभूय having enjoyed, अल्पामपि though in small measure, आपदम् trouble, प्राप्य having obtained, दुष्यन्ति censure them, प्रजहत्यपि or even abandon them, एषः this, नारीणाम् women's, स्वभावः nature.

Though they have enjoyed all pleasures (with their husbands) earlier, they censure them in the wake of the slightest trouble or even abandon them. This is the nature of women.