Arthit had been repressing his feelings for Kongpob for far too long. He had been in love with him since their college days, but stayed silent, unable to confess his emotions to his friend. 

However, all of that changed when Kongpob started dating someone else.

Arthit was filled with both anger and jealousy. He couldn't believe that his best friend was now in a relationship with someone else, and he felt like he had missed his chance. He tried to stay away from Kongpob, but with their jobs as colleagues at the same office, it was impossible to ignore his presence. 

Kongpob noticed that something was off with Arthit. He knew that they had grown apart, but he had no idea why. He tried to talk to Arthit, but Arthit brushed him off and avoided him at all costs. Kongpob couldn't understand why Arthit was acting like this, and it made him feel frustrated and confused.

One day, Arthit finally broke down and confessed his feelings to Kongpob. He told him how much he loved him, and how long he had been harboring these feelings. Kongpob was shocked, but also a little hurt. He didn't understand why Arthit had been hiding this from him for so long.

After that confession, things between them were never the same. Kongpob remained in his current relationship, and Arthit was left with a broken heart. They tried to maintain a professional relationship, but the tension and awkwardness between them were too much to handle. They stopped talking, and would only acknowledge each other's existence when necessary.

Arthit regretted telling Kongpob how he felt. He felt like he had ruined their friendship, and that he had lost the one person he cared about the most. On the other hand, Kongpob felt guilty for not realizing Arthit's feelings earlier. He didn't know what to do to fix things between them.

Eventually, Arthit decided to leave his job and move away, hoping that distance would help him move on. Kongpob was saddened by this, but he knew that it was for the best. It gave them both space to heal and maybe, in the future, rekindle their friendship.

For now, their relationship was strained and awkward. They were two best friends who had become strangers, and it hurt both of them. The angst between Arthit and Kongpob would linger on for years, and they both wished that things could have been different.