How did he end up this way???

It is sobering to read what he was like in the beginning of his journey and what he ended up being and accomplishing...

This is account of the end of Columbus' life from the site Taylor posted...

"During Columbus' stint as governor and viceroy, he had been accused of governing tyrannically. Columbus was physically and mentally exhausted; his body was wracked by arthritis and his eyes by ophthalmia. In October 1499, he sent two ships to Spain, asking the Court of Spain to appoint a royal commissioner to help him govern.

The Court appointed Francisco de Bobadilla, a member of the Order of Calatrava; however, his authority stretched far beyond what Columbus had requested. Bobadilla was given total control as governor from 1500 until his death in 1502. Arriving in Santo Domingo while Columbus was away, Bobadilla was immediately peppered with complaints about all three Columbus brothers: Christopher, Bartolomé, and Diego. Consuelo Varela, a Spanish historian, states: "Even those who loved him [Columbus] had to admit the atrocities that had taken place."^[29][30]

As a result of these testimonies and without being allowed a word in his own defense, Columbus upon his return, had manacles placed on his arms and chains on his feet and was cast into prison to await return to Spain. He was 53 years old...

According to testimony of 23 witnesses during his trial, Columbus regularly used barbaric acts of torture to govern Hispaniola. ^[26]

Columbus and his brothers lingered in jail for six weeks before the busy King Ferdinand ordered their release. Not long thereafter, the king and queen summoned the Columbus brothers to their presence at the Alhambra palace in Granada. There the royal couple heard the brothers' pleas; restored their freedom and their wealth; and, after much persuasion, agreed to fund Columbus' fourth voyage.

On May 20, 1506, at about the age of 55, Columbus died in Valladolid, fairly wealthy from the gold his men had accumulated in Hispaniola. When he died he was still convinced that his journeys had been along the east coast of Asia..."