CC Antya 4.62

gāḍhānurāgera viyoga nā yāya sahana
tāte anurāgī vāñche āpana maraṇa
Word for word: 
gāḍha-anurāgera — of one who has deep attachment; viyoga — separation; nā — not; yāya sahana — tolerated; tāte — therefore; anurāgī — a deeply attached devotee; vāñche — desires; āpana maraṇa — death of himself.
Translation: 
“One who is deeply in love with Kṛṣṇa cannot tolerate separation from the Lord. Therefore such a devotee always desires his own death.