CC Madhya 8.214
tāṅ-sabāra prema dekhi’ kṛṣṇa haya tuṣṭa
“The transcendental mellow is nourished by that mutual behavior in transcendental love of Godhead. When Lord Kṛṣṇa sees how the gopīs have developed pure love for Him, He becomes very satisfied.
Śrīmatī Rādhārāṇī and the gopīs are not interested in their personal happiness derived from association with Kṛṣṇa. Rather, they become happy by seeing one another associate with Kṛṣṇa. In this way their dealings are further nourished by love of Godhead, and seeing this, Kṛṣṇa is very pleased.