King of Cups – Love and Relationship Outcome
The King of Cups in a Tarot reading is someone who will be friendly and of service to you, sensitive, fair and honest which may cause you to open up your feelings to new experiences, but beware of he does not abuse his position or only pretends to help when he really means ill will.
In the reversed position is more likely which is indicative of a double dealing cold hearted con man causing you serious loss in love and life leaving you bitterly disappointed.
King of Cups – As a Man, Outcome and Feelings
Honest man, philosophical or idealistic, doctor or professor, teacher, man of the law, traveller, promoter, inspirer, hunter, wanderer, sailor, etc. The querent’s actions, business or wants will be judged and brought to light. There may be some exaggeration, fantasy or want of accuracy, but there is certainly hope and promise for the future. Perhaps travelling on the sea. Waite rightly observes under this head: “The implicit is that the sign of the Cup naturally refers to water, which appears in all court-cards” (i.e. of this suit.) A. E. Thierens, 
King of Cups
Pictorial Key to the Tarot – Rider-Waite-Smith
By A.E. Waite (1911), tarot card illustrations by Pamela Colman Smith (1911)
He holds a short sceptre in his left hand and a great cup in his right; his throne is set upon the sea; on one side a ship is riding and on the other a dolphin is leaping. The implicit is that the Sign of the Cup naturally refers to water, which appears in all the court cards.
Meanings King of Cups in a Reading
Fair man, man of business, law, or divinity; responsible, disposed to oblige the Querent; also equity, art and science, including those who profess science, law and art; creative intelligence.
King of Cups – Reversed
Dishonest, double-dealing man; roguery, exaction, injustice, vice, scandal, pillage, considerable loss.
Additional Divinatory Meanings
Beware of ill-will on the part of a man of position, and of hypocrisy pretending to help.
Additional Meanings – Reversed
By S. L. MacGregor Mathers, c 1888
King of Cups
King of Cups – A fair Man, Goodness, Kindness, Liberality, Generosity.
Divinatory Meanings – Reversed
A Man of good position, but shifty in his Dealings, Distrust, Doubt, Suspicion.
General Book of the Tarot
By A. E. Thierens, 
King of Cups
Fair and honest man; man of business, law or divinity; responsible, disposed to oblige the querent; probity, equity, art and science, and those who profess science, art and law. Reversed: Honest or dishonest man equally (?); thief, brigand, rogue. Vice, corruption, scandal.
This king is the chief of the kingdom of the soul, coming on the Ninth house, and consequently must indicate the teacher, prophet, man of law and divinity; the professor, inspirer and great traveller; sometimes a hunter, a wanderer, or a sailor, a yachtsman. Honesty and probity will be generally his characteristics, but some fantasy may be mixed with it and he may be less particular in details or accuracy. He may be exuberant or even excessive, and this may cause some excitement, but we see nothing of ‘scandal, vice,’ thievishness or anything of that kind in this card. There is a lively sentiment of justice in it and the person indicated by it will certainly be disposed to render justice to the querent, whether he be connected with the law or not. If the querent is himself a weak or vicious individual, the card may indicate the judge before whom he has to appear. At all events it may represent the idea of judgment of the querent’s actions or business. Further there is less of ‘science’ in this card than of philosophy, which is quite another department. There is the idea of promoting, inspiring, pushing. There lies promise for the future and likeliness of monetary advances in this Sagittarian card.
The Oracle of the Tarot – Exoteric Tarot
By Paul Foster Case (1933)
King of Cups
The YOD in the vesica refers to the attribution of all Kings to the Sephirah of Wisdom, and to the letter Yod. He represents the positive aspects of desire-force in the mental realm.
From beginning of last decanate of Gemini to end of second decanate of Cancer, June 20th to July 10th, combining the rulerships of Saturn-Uranus, the Moon, and Mars. Subtle and secretive; crafty, psychic, artistic; strong, violent desires, but calm exterior.
Friendly to the Querant, and really wise.
Evil and merciless, and likely to be attracted by occult studies promising power and wisdom for the satisfaction of desire without purification of character.
Fair-haired and blue eyes.
More information on the King of Cups Tarot card.