It’s one thing to feel anxious when someone close to you goes away for a few weeks or months. It’s another thing to feel completely lost in the world just because that person is absent for a few days or hours. Struggling to deal with the absence of someone else over such a short period of time can be a symptom of dependent personality disorder.
In cases where DPD has become a problem, the afflicted individual may be unable to focus on anything but the missing person until their return. This could make them less effective at their job, managing personal hygiene, or looking after relationships with friends and family.