I understand. If it were me, and Zed or Molly (not sure who is representative of who) meant a lot to me, I would approach the whole situation with some hesitance. Not draw any conclusions on what their intentions are because from where I stand they seem like they could be anything.
If they know that you struggle with reading social information like this, you could try to politely ask "what's on your mind" next time you see them. Depending on how close you were with them prior to the relationship or if you are even interested in salvaging the friendship, you could try and let them know that you're having a hard time with it and would like to work things out.
Also, I'm thinking that the way Zed has been putting things into short snippets rather than long conversation makes me think that he feels a little awkward coming back into the relationship. If the falling out was an angry fight, he might be assuming that Molly is completely done with him, even if that's not the case. However, if the falling out was more just not being able to talk for awhile and gradually falling out of contact, he might feel strange coming back to something after so long.
Like I said, there's a lot of ways to interpret this situation. My only advice would be to tread lightly.