The way I look at it, you tend to create a circle of friends from the people you spend a lot of time around. Your specific relationship with them largely depends on how much you have in common, what activities you do together and how frequently. It’s all a matter of degrees. And it can change over time.
On one end of the scale, you have “acquaintances”. Basically anyone who you might say “hi” to in the hallway or chat with at the water cooler. On the other end, you may have a life-long BFF who maybe you don’t even see for years at a time, but when you do, it’s like you just pick up where you left off.
In between, you have any number of contacts, pals, friends of friends, work friends, golf (or whatever activity you do) buddies, drinking buddies, old college pals and what have you.
My best friends are probably a subset of my college fraternity brothers. We tend to only see each other at major life events, but we continue to stay in touch over the years.
The next level is probably a group of work friends from a former job. Basically a bunch of former Deloitte Consultants that all ended up working at the same boutique consulting firm together (and in some cases, several jobs afterwards). Which for all intents and purposes, similar to a fraternity (many of my fraternity brothers ended up at Accenture Consulting and have a similar relationship with their coworkers). Many of us still meet socially on a regular basis.
There’s a couple of inter-related bars I go to regularly. Actually a holdover from the same previous job. I’ve become friendly with the owners, staff, management, some regulars (some of which who are coworkers/professional contacts), former staff who became regulars. But most of these relationships are pretty superficial. Fine for drinks and a few laughs after work on occasion, but it’s not like we spend time over each other’s homes.
I’m friendly with most of my current coworkers. But other than company sanctioned drinks, I don’t really ever hang out with them socially. My previous job we used to regularly hang out at each other’s homes, stay out late getting into trouble, even go to each other’s weddings and bachelor parties. Part of it is I’m a lot older now with a wife and kid. Part of it is I simply don’t like my current coworkers that much.
“Helping you bury the body” is a high demand for any friendship. A true friend probably wouldn’t try to involve you in covering up a felony in the first place. So generally I’m just content to have a couple people to shoot the shit with over beers from time to time.