Well of course Dario is hurt. In a post you even said "^Yeah but this is for real. We will be arriving in Poland next Saturday night. I can't wait." and now you are saying it was all a lie? You not only mentioned him last, it seems, but you kept it going, which probably hurts him in more ways than one. Hopefully he forgives you though, even though I am not quite sure what your intent was with the joke in the first place.
Not to mention, even "Friends >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Lies/Fun" does not sound like a total apology. I am not even part of this but if I was, it would sort of seem like you cannot have fun with your friends? Then are they really your friends? It is such a weird statement.
Despite it all, I do hope you feel better soon.