<human>: Can you give me a shortened version of the text?

Let me preface this by saying that I am a total doofus when it comes to human interactions and while the solution for what I am asking is probably obvious for most people, it isn't for me. I'm incredibly socially awkward and I have zero intuition when it comes to interpersonal communication. 

So a friend of mine, hereby refered to as Runa has a friend, let's call him Linus. I met Linus a handful of times, usually when Runa had him tagging along. He's a nice enough guy, so I didn't mind. I didn't think much of it when Linus, after I hadn't seen him in months, started contacting me via instant messenger. I thought 'Whatever' and went along with it. For me it was more or less just a means to train my smalltalk skills (and it really was just totally superficial smalltalk). After a month of this he asked me whether we could get a drink together some time. I, not thinking much about it, said okay. Not long after that I talked to Runa who told me that Linus thinks he's having a date with me. I had no idea, I thought this drink thing was just about randomly hanging out (with Runa, on top of that!). To clarify something about me, I've never had a date and I have no interest in having one either, this is a completely new situation to me. So for my obvious question: How exactly do I kindly let him know that I'm not interested in him in that way? Go there anyway or cancel? Just vanish? How do I word this? Should I drag Runa along (known her for over 15 years and she just gets me and could be a translator)? How do I even explain why I misunderstood his intentions in the first place? I don't want to give him any false hopes and it's just really embarassing for me to admit that I had no idea he was trying for a date.

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<bot>: Guy thinks he has a date with me. I'm clueless when it comes to social interactions, so how do I kindly tell him I'm not interested?