Kamasutra 6.5.16

6.5.16

ciram ārādhito 'pi tyāgī vyalīkam ekam upalabhya pratigaṇikayā vā mithyādūṣitaḥ śramam atītaṃ nāpekṣate/

When one of two lovers is grateful, and the other liberal, some Sages say that the liberal one should be preferred, but Vatsyayana is of opinion that the former should be chosen, because liberal men are generally haughty, plain spoken, and wanting in consideration towards others. Even though these liberal men have been on friendly terms for a long time, yet if they see any fault in the courtezan, or are told lies about her by some other woman, they do not care for past services, but leave abruptly. On the other hand, the grateful man does not at once break off from her, on account of a regard for the pains she may have taken to please him. In this case also the choice is to be guided with regard to what may happen in future.