I worked at an office for over a year. I made what I thought were some great connections with three people. We had a blast every day at work. We messed around, had inside jokes, played pranks on each other, texted and on the rare occasion hung out together outside work.
Six months ago, I got an opportunity for a nearby similar job but for more pay. I would be doing the exact same thing but instead of being in that office, I would simply be next door at one of our contractors. I would still get to see all my work friends every single day, doing the same things I always had, just in a slightly different context. The only difference was who put money in my pocket at the end of the day.
Now, they don't appear to be my friends anymore. They don't include me, nor text or communicate with me much, nor hang out, despite me trying. Every interaction is very bland and professional or at an arm's length. I'm not part of the team, and any issue between the offices, I'm not treated as a peer, but rather strictly business associate.
The second that work commiseration from being under the same roof was gone, I was no longer a work friend, I was some guy who works nearby. Work friendships are facades that people use to get through their work day, because you aren't voluntarily being there, you're forced by unemployment to be there, and you wouldn't know those people in any other context. The second the joint trauma is gone, there's less in it for them to maintain a friendship with you.