The context of the following conversation is Alex wandered away. Alex never came back. Nobody ever knew what became of them.:
Alex says Before I moved here, I lived in Los Angeles..
The friend responds Why'd you leave?.
Alex responds I just got bored and just left one day, and never returned..
The friend responds Seriously?.
Alex responds Yep, I haven't talked to anyone there since. I wonder if they know why I left..
The friend responds They're probably worried about you!.