Unfortunately, her (Rukmini's) elder brother Rukmi was envious of Krsna and therefore wanted her to be offered to Sisupala. When Rukmini became aware of this, she was greatly aggrieved

Expressions researched:
"Unfortunately, her elder brother Rukmī was envious of Kṛṣṇa and therefore wanted her to be offered to Śiśupāla. When Rukmiṇī became aware of this, she was greatly aggrieved"

Sri Caitanya-caritamrta

CC Antya-lila

This verse was spoken by Rukmiṇīdevī in Śrīmad-Bhāgavatam (SB 10.52.43). Rukmiṇīdevī, the daughter of King Bhīṣmaka, had heard about Kṛṣṇa’s transcendental attributes, and thus she desired to get Kṛṣṇa as her husband. Unfortunately, her elder brother Rukmī was envious of Kṛṣṇa and therefore wanted her to be offered to Śiśupāla. When Rukmiṇī became aware of this, she was greatly aggrieved.

CC Antya 4.63, Translation and Purport

“‘O lotus-eyed one, great personalities like Lord Śiva desire to bathe in the dust of Your lotus feet to drive away ignorance. If I do not get the mercy of Your Lordship, I shall observe vows to reduce the duration of my life, and thus I shall give up bodies for hundreds of births if it is possible to get Your mercy in that way.’

This verse was spoken by Rukmiṇīdevī in Śrīmad-Bhāgavatam (SB 10.52.43). Rukmiṇīdevī, the daughter of King Bhīṣmaka, had heard about Kṛṣṇa’s transcendental attributes, and thus she desired to get Kṛṣṇa as her husband. Unfortunately, her elder brother Rukmī was envious of Kṛṣṇa and therefore wanted her to be offered to Śiśupāla. When Rukmiṇī became aware of this, she was greatly aggrieved. Thus she wrote Kṛṣṇa a confidential letter, which was presented and read to Him by a brāhmaṇa messenger. This verse appeared in that letter.