Swamini Vasna Radha Swayam Vrindavaneshwari - Maaheshvar Tantra (11.31)

svāminī vāsnā rādhā svayaṅ vr̥ndāvanēśvarī.
lavamātrakālāvacch_innō virhō’bhūdasātmakaḥ.
- Maaheshvar Tantra (11.31)

Shri Radha is the governess of Shri Krishna and the Queen of Vrindavan Herself. Even a momentary separation is unbearable for them.