I worked the same shift as my girlfriend and an older coworker. We always went home together and spent late-night shifts side by side. But one day, my schedule changed, and the senior coworker started giving her rides home. I felt a bit lonely, but since she was serious and faithful, I thought everything was fine. However, after that, she stopped replying to my calls and skipped work without notice. I grew worried. I tried calling the senior coworker too, but couldn't get through... What exactly was going on? Could it be that something happened between her and the senior coworker when they were alone together?