Yes Jesus IS the Husband he is telling her to go and bring back. He is literally talking about himself. :) "If you knew who it was you were talking to"
Her responding to that question by answering that "She has no husband" and Jesus responding that she has actually had 5 husbands again is working on 2 levels. The woman is talking about her physical relationships - Jesus is using thisher personal situation as a symbolic parrallel for the "spiritual relationships" Samaria/Northern Kingdom formed with "other gods".
This meeting the conclusion of a long running story in the old testament that begins in the book of Kings - carries on through the book of Hosea where the prophet marries a prostitute which represents "Samaria" who then commits adultery with other men and bares illegitimate children.
When the Northern Kingdom of Israel separated from the Southern Kingdom of Judah in 1 Kings 12 they were later cutoff and conquered by the Assyrian empire in 722BC. The reason for their being conquered is covered in 2 Kings 17. It is for the sin of Idolatory and worship of other Gods.
This is "Spiritually Adultery". Having many "spiritual" husbands and breaking the covenant with YWHW. This is made explicitly clear in the book of Hosea where the prophet is instructed to "act this out" with his own marriage.
Hosea 1:2
When the Lord began to speak through Hosea, the Lord said to him, “Go, marry a promiscuous(I) woman and have children with her, for like an adulterous wife this land is guilty of unfaithfulness(J) to the Lord.”
Rebuke your mother,(B) rebuke her,
for she is not my wife,
and I am not her husband. Let her remove the adulterous(C) look from her face
and the unfaithfulness from between her breasts. 3 Otherwise I will strip(D) her naked
and make her as bare as on the day she was born;(E) I will make her like a desert,(F)
turn her into a parched land,
and slay her with thirst. 4 I will not show my love to her children,(G)
because they are the children of adultery.(H) 5 Their mother has been unfaithful
and has conceived them in disgrace. She said, ‘I will go after my lovers,(I)
who give me my food and my water,
my wool and my linen, my olive oil and my drink.’(J) 6 Therefore I will block her path with thornbushes;
I will wall her in so that she cannot find her way.(K)
Thus in the story the womans own personal relationships, adultery and multiple husbands are used to represent Sarmaria and the Northern Kingdoms past spiritual Adultery against YWHW - her first Husband. Jesus by meeting with the woman at the well is essentially "symbolically" offering to "redeem" and remarry "Samaraia" and restore her to her original place as his wife.