His troubles began when he narrowly avoided being targeted by an unknown person, which increased his vigilance of his surroundings.
Jack did not wish to believe it at first that someone was out to get him, but it was later confirmed that his suspicions were correct.
Those situations caused him to raise his guard even further and to start cutting off contact with others to make himself more difficult to locate.
Jack couldn't help but try to think about why people were after him, but he could not pin down the exact person whom he could suspect.
The problem was that he had taken action too violently in ways that would not get him the information he needed from those who targeted him.
Those who had been targeting him seemed to have the intention of hurting or even killing him, so he could not relax his guard against them, and he could not afford to be soft on them.
