What is the psychology of a person who hasn't contacted for seven years and suddenly threatens one day?

Resentment and resentment accumulation, psychological control and power desire.

1. Resentment and resentment accumulation: Long-term lack of contact leads to the accumulation of some negative emotions, resentment or dissatisfaction between the two parties. Emotion and resentment exert pressure on the individual's mentality to a certain extent, and at a certain moment, they urge threatening behavior. Threatening is dissatisfaction or anger towards the other party.

2. Psychological control and power desire: The sudden threatening behavior also implies the psychological factors of control and power desire. People grasp each other's emotions and behaviors through threats and intimidation, so as to gain a sense of their own superiority or the satisfaction of exerting influence on each other.