LyrArc Article Gist
This inside account of the events leading to the cancellation of the meeting with Kim Jong Un of North Korea shows how quickly the idea of a meeting between the two leaders unraveled following Trump's statements about the Libyan example being followed by North Korea. Soon after the suggestion for a Trump meeting was made by Kim Jong Un to South Korean officials Mr Trump picked up and endorsed the idea. North Korea made a public announcement critical of Mr. Trump  and National Security Adviser John Bolton took this up with Mr. Trump at 10 pm on May 23, 2018.  This report says Mr. Trump fearing that Kim Jong Un was looking for a way to back out of the talks acted first- possibly sensing that Mr. Trump could be made to look weak and small if the situation continued to develop and the U.S. is seen as a desperate suitor. The meeting had been set for June 12 in Singapore. 

In the end the South Koreans and the Japanese were the last to learn about the cancellation and were taken by surprise by Trump's decision.