Don't get too attached to your job or your colleagues.
I spent over 6 years at a major MNC corporate, friendship that got built there through coffee meets, lunches, sports, walks, helping their families, kids, becoming close buddies to attend marriages and seeing families growing over years.
All this disappeared in a moment that I left.
No calls, no contacts, no messages, no emails.
All vanished. Imagine running to donate blood in late nights, caring their old parents by rushing in overnight train journey because they were abroad. Helping their sisters wedding by taking days off. No one turned up when I needed help once I left.
Friends that I though would be life long were just colleagues for a career aspirations, competitors eying that promotions and bonuses.
Lesson - Colleagues are not necessarily friends. build your circle and friends outside office as well.