I struggled to make friends at work, and it was even harder to keep them once I left the job. A simple tip from a therapist helped.
Briefly

"Similarity is a major predictor of friendship," she told me. "Coworkers at least have the workplace in common, so that is a good place to start. From there, you can branch out into finding out whether you and a coworker have other things in common."
"Part of the issue is the fact that you no longer see this person on a regular basis," Fehr said. "Also, you now have less in common, especially if your friend is still at the same workplace. When we lose that proximity, it becomes much more difficult to maintain the relationship."
Discovering these similarities was unexpected. From that moment on, I felt increasingly relaxed with my colleagues; I could see ourselves becoming friends.
Fehr advised to make a deliberate effort to maintain contact with them. I just have to schedule a time to meet up for a casual hangout.
Read at Business Insider
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