He thought Earthmen had no right to force their way onto Mars, especially when the popular theory of helping a dying Martian civilization required killing millions in the process. He also believed Martians had the right to let their civilization crumble if they chose to.
He found a maze of wiring and tiny mechanisms, realizing it was a time trap, an ancient Martian time machine designed as a booby trap.
He read magazines, watched TV, listened to the radio, worked crossword puzzles, explored his apartment, and tried to sleep, but none of these activities lasted beyond the ten-minute time loop.
The primary danger was boredom, which he likened to an enemy that could drive him insane by forcing him to endure endless, identical ten-minute intervals without physical fatigue or hunger.
He used the telephone to repeatedly call her, learning details about her life until he could convince her they were old friends. Eventually, he climbed through the window into her apartment to meet her in person.
The ruby triggered the time trap, activating the Martian time machine and initiating the repeated ten-minute time loop that trapped the protagonist.
He came to see it as a gift that granted him extra years of life, as he lived through countless ten-minute intervals, exploring various activities and interactions to combat boredom.
He eventually succumbed to the mental strain of endless memories, describing it as a crushing weight that grew over time, leading to his eventual mental collapse and realization that the time trap was a torture machine.
Hear the fully-produced version with music and sound effects at https://shows.acast.com/auditory-anthology/episodes/the-beast-of-boredom-by-richard-r-smith)"The Beast of Boredom" by Richard R Smith -- from "Infinity" magazine April 1958.