If that were the case, it would mean that Bhagavān Śrī Kṛṣṇa lied when He said to the Vrajavāsīs that He would soon return. When Śrī Kṛṣṇa was departing from Vraja for Mathurā, Śrīmad-Bhāgavatam records that Śrī Kṛṣṇa promised:
āyāsya iti
I shall return.—Śrīmad-Bhāgavatam 10.39.35
Not only this, even when Nanda Mahārāja and the other Vrajavāsīs were returning to Vraja after the killing of Kaṁsa and the crowning of Ugrasena as king, Kṛṣṇa again promised Nanda Mahārāja:
vayaṁ ca ... draṣṭum eṣyāmo
We shall come to you and become the object of your vision.—Śrīmad-Bhāgavatam 10.45.23
Would Śrī Kṛṣṇa lie on both occasions? One of the names of Bhagavān Śrī Kṛṣṇa given in a nāma-stotra in the Brahmāṇḍa Purāṇa is:
satya-vāk satya-saṅkalpaḥ
Kṛṣṇa's speech is truthful, and His resolve or undertaking is unfailingly accomplished.—Brahmāṇḍa Purāṇa
Even if someone says that perhaps Kṛṣṇa did not lie consciously, but due to circumstances He could not fulfil His promise, that is not possible because He is satya-saṅkalpaḥ. His resolve never fails. No circumstances can thwart the plan of Bhagavān and make His statement go untrue.
Furthermore, in the Hari-vaṁśa Purāṇa, Śrī Kṛṣṇa declares to Nārada Muni:
nānṛtaṁ hi vaco vipra! proktapūrvaṁ mayānagha!
O brāhmaṇa! O sinless one! I have never previously spoken an untruth.—Hari-vaṁśa Purāṇa 125.37
According to the Viṣṇu-yāmala, quoted in Bhakti-rasāmṛta-sindhu 2.1.247–248, conditioned mortals have eighteen defects, one of which is the tendency to speak lies (asatyam). Bhagavān, however, is completely free from such defects:
aṣṭādaśa-mahā-doṣair rahitā bhagavan-mūrtiḥ
Bhagavān is free from the eighteen great defects.—Bhakti-rasāmṛta-sindhu 2.1.246
In fact, Śrīmad-Bhāgavatam, the crest jewel of all Vedic literature, begins by glorifying Śrī Kṛṣṇa as:
satyam paraṁ dhīmahi
We meditate upon the Supreme Truth.—Śrīmad-Bhāgavatam 1.1.1
So how could Bhagavān Śrī Kṛṣṇa ever lie?
Even if one were to say that Kṛṣṇa lied despit
e being satya-vāk, then could even His best devotee, Śrī Uddhava, also lie? Uddhava said to the Vrajavāsīs:
āgamiṣyaty adīrgheṇa kālena vrajam acyutaḥ
Acyuta will soon return to Vraja.—Śrīmad-Bhāgavatam 10.46.34
Acyuta means One who never fails to keep His promises or fails in His commitments to His devotees. After all, how could Bhagavān, who is satya-vāk, who never speaks an untruth at any time or to anyone, speak such an untruth to those who are most dear to Him—the Vrajavāsīs?
yaḥ kadācid api kutrāpy anṛtaṁ na vakti, so ’tipriyeṣu kathaṁ tad vaded iti
He who never speaks an untruth at any time or anywhere—how could He speak such an untruth to those who are especially dear to Him?—Śrī Baladeva Vidyābhūṣaṇa’s Sāraṅga-raṅgadā-ṭīkā on Laghu-bhāgavatāmṛta 1.5.478
Thus, the fact is that Śrī Kṛṣṇa indeed returned to Vraja. After killing demons such as Śālva, Dantavakra and Vidūratha, Kṛṣṇa did come personally and stayed with the Vrajavāsīs for two months before He made His manifest līlā unmanifest. This has been explained by our ācāryas in their granthas such as Laghu-bhāgavatāmṛta and others, quoting pramāṇas from the Padma Purāṇa, Bṛhad-Viṣṇu Purāṇa and others.
In fact, even before Śrī Kṛṣṇa physically returned to Vraja, while He was still situated in Mathurā and Dvārakā, He manifested to the Vrajavāsīs in the form of visphūrti (a special manifestation of His presence), and also through sudden āvirbhāva (direct manifestation), appearing before those devotees whose hearts were overwhelmed by the intense distress of separation.