the first thing i wonder when i read your post is if you somehow contected with this poster the one time you talked. It sounds like you must have had something in common like they could relate to you about something personal.

In your dreams they all have a similiar feeling. You and this person share something important and you want to help each other. But in the end that person disappears or fails you in some way. I get the feeling that in real life you wanted to talk to this person a second time but they failed you by not being there.