Kamasutra 6.4.35

6.4.35

a:pūrva-pūrva-saṃsṛṣṭayoḥ pūrva-saṃsṛṣṭaḥ śreyān. sa hi vidita-śīlo dṛṣṭa-rāgaś ca sūpacāro bhavatīty ācāryāḥ.

When a woman has to choose between two lovers, one of whom was formerly united with her, while the other is a stranger, the Acharyas (sages) are of opinion that the first one is preferable, because his disposition and character being already known by previous careful observation, he can be easily pleased and satisfied; but Vatsyayana thinks that a former lover, having already spent a great deal of his wealth, is not able or willing to give much money again, and is not therefore to be relied upon so much as a stranger. Particular cases may however, arise differing from this general rule on account of the different natures of men.