During this time-frame Yochanan was in the prison of Machaerus, being thrown into prison by Herod. His "crime" had been reproving Herod for taking Herodias, his brother Philip's wife, an act against the commandments of YHWH. By this time some of Yochanan's disciples had already responded to the witness of Yochanan, and had gone over to Y'shua as Messiah.

However, some of Yochanan's disciples had not yet done that, perhaps because of loyalty to Yochanan and/or perhaps because of doubts that Y'shua could really be the Messiah for whom the nation had been waiting so very long. Being a prophet, Yochanan knew that his end was immanent at Herod's hand. Being a righteous man and a true shepherd, he was concerned for the future of the disciples whom he would soon be leaving behind. That's why he sent two of his disciples to Y'shua to ask “Are you he who comes, or should we look for another?” Notice who they were representing - "should WE" they said. The phrasing of the question indicates it is offered, not from the standpoint of Yochanan, who already knew the answer, but from the standpoint of his disciples. This is why Yochanan had sent them - to get the assurance they needed regarding Y'shua, so they would not be left in unbelief when their leader, Yochanan, soon would die.

No doubt the answer Y'shua gave them was proof enough of the truth. He said:

Go and tell Yochanan the things which you hear and see: the blind receive their sight, the lame walk, the lepers are cleansed, the deaf hear, the dead are raised up, and the poor have good news preached to them. Blessed is he who finds no occasion for stumbling in me. Matt 11:4-6

Notice that YHWH considers worship of the so-called "queen of heaven" a "shame" to those worshipping her.

Notice this commentary explaining more:

The deity so zealously worshipped by the people is called the Queen of heaven, and is mentioned only by Jeremiah. Besides here, there is reference to her in Jer_44:17, where we see that her worship was very diligently cultivated, and that she was adored as the bestower of earthly possessions. This worship was combined with that of the stars, the host of heaven, which especially prevailed under Manasseh (2Ki_21:5). Thence it may be presumed that the Queen of heaven was one of the deities who came to Western Asia with the Assyrians, and that she corresponds to the Assyrian-Persian Tanais and Artemis, who in the course of time took the place once occupied by the closely related Phoenician Astarte. She is originally a deification of the moon, the Assyrian Selene and Virgo caelestis, who, as supreme female deity, was companion to Baal-Moloch as sun-god. [K&D Commentary - Jer 7:18]

YHWH stands out in sharp contrast to the pagan gods. The "wife" of YHWH is no female deity. His wife is His people, Israel, whom he took by marriage covenant as His own, at Mount Sinai! Surely, He would not have done this if there was already a Mrs. YHWH in Heaven!

The Bride in Revelation is the same Bride YHWH wed at Mount Sinai, namely Israel. A redeemed Israel will once again enjoy the favor of YHWH as her Husband and Redeemer. Notice how this language of an eternal covenant points forward to the blessedness of the New Jerusalem and the Bride of Revelation. This is the Israel to come:

"For your[Israel] husband is your Maker, Whose name is YHWH of hosts; And your Redeemer is the Holy One of Israel, Who is called the God of all the earth.
"For YHWH has called you, Like a wife forsaken and grieved in spirit, Even like a wife of one's youth when she is rejected," Says your God.
"For a brief moment I forsook you, But with great compassion I will gather you.
"In an outburst of anger I hid My face from you for a moment, But with everlasting lovingkindness I will have compassion on you," Says YHWH your Redeemer.
"For this is like the days of Noah to Me, When I swore that the waters of Noah Would not flood the earth again; So I have sworn that I will not be angry with you Nor will I rebuke you.
"For the mountains may be removed and the hills may shake, But My lovingkindness will not be removed from you, And My covenant of peace will not be shaken," Says YHWH who has compassion on you.
"O afflicted one, storm-tossed, and not comforted, Behold, I will set your stones in antimony, And your foundations I will lay in sapphires.
"Moreover, I will make your battlements of rubies, And your gates of crystal, And your entire wall of precious stones.
"All your sons will be taught of YHWH; And the well-being of your sons will be great. 
"In righteousness you will be established; You will be far from oppression, for you will not fear; And from terror, for it will not come near you. Isa 54:5-14