Job sounds sketchy, maybe there was no intention to pay you. The fact that you can't get a hold of the "boss" is the sign there not the two other workers. Even if they had said something, you should be able to get a hold of management at a reputable place.

Friend? Well maybe you're reading too much into it. Sometimes I talk to people on Facebook and don't say bye when I get distracted with other things or think a conversation is over. It's a bit like texting. No one ever texts "ttyl" much anymore. You just put the phone down and pick it up later when it is convenient.