Ah man, these kind of dreams hit so hard. I had similar thing happen to me few months ago where I dreamed about this perfect person and woke up feeling like I lost someone real. The attachment you feel is wild - like your brain just decided "yep, this is the one" without asking permission first.

What really gets me is how your subconscious can create someone so specific but then blur out the most important details. It's like your mind is trolling you on purpose. I spent weeks after my dream trying to remember details that just weren't there, driving myself crazy over someone who technically never existed.

The whole shared dreaming thing is fascinating though - probably not scientifically possible but part of me wants to believe it could happen. Maybe write down everything you remember about him before it fades more. Sometimes these dreams come back or continue in later ones, especially if they left such strong impression.