gopī-saṅge - with the gopīs; yata līlā - all pastimes; haya upavane - that are in those gardens; nigūḍha - very confidential; kṛṣṇera - of Lord Kṛṣṇa; bhāva - ecstasies; keha - anyone; nāhi - does not; jāne - know.

“All the pastimes with the gopīs that take place in those gardens are very confidential ecstasies of Lord Kṛṣṇa. No one knows them.