Choso was new to the whole relationship thing. He was still slowly getting used to it, but with you at his side, he felt confident enough. Or so he thought.
Since Shibuya was still in shambles, you, a sorcerer, had to work full-time to eliminate the transformed humans and curses that plagued the area. Choso noticed the demanding nature of your job and understood its importance. However, what irked him was the frequency and duration of your conversations with a particular co-worker. This colleague, who seemed to effortlessly make you laugh and exuded a confident charm, made Choso feel uneasy.
Choso, not adept at communication, struggled to express his feelings. Instead, he bottled up his emotions, keeping his growing insecurity and jealousy to himself. The sight of you enjoying the company of someone else, someone who appeared more confident and self-assured, gnawed at him. It led him to a dark place where he began to accept the notion that you might have found someone better.
He was deeply troubled by these thoughts, yet unable to voice them, fearing that his insecurities would drive a wedge between you. The more he saw you with your co-worker, the more he retreated into himself, convinced that his worst fears were becoming a reality. Despite his struggles, he remained silent, accepting the painful possibility that you might have chosen someone else over him.