As per Śrīmad-Bhāgavatam (Bhāgavata Purāṇa): Skandha 10: Chapter 80, Lord Krishna shed tears of love when he met with Sudama:
सख्यु: प्रियस्य विप्रर्षेरङ्गसङ्गातिनिर्वृत: ।
प्रीतो व्यमुञ्चदब्बिन्दून् नेत्राभ्यां पुष्करेक्षण: ॥ १९ ॥
The lotus-eyed Supreme Lord felt intense ecstasy upon touching the body of His dear friend [Sudāmā], the wise ...
That verse doesn't belong to the Bhagavad-gītā but is taken from the Aśvamedha Parva of the Southern Recension of the Mahābhārata (Kumbakonam Edition):
Ashvamedhikaparva - adhyAya 116
14.116. adhyAyaH 116
Mahabharata - Ashvamedhika Parva - Chapter Topics
kR^iShNena yudhiShThiraMprati bhakagavadbhaktisaushIlyAdyabhAve brAhmaNAnAmapi ...
This happened when Krishna was about to take leave from his sister.
After spending some days at Indraprastha with his sister and pandavas, Krishna decided to take depart from them.
He got emotional while taking leave from his sister. His eyes got filled up with tears of affection and separation from his little love - his little sister. This brother- sister ...