Long time lurker, first time poster in this topic, looking to anyone who has more experience than I do that can shed some light on how to proceed with this situation.
I'll try not to drip feed!
I am 22, attending University [late starter, worked in retail after dropping out of my A levels then eventually got accepted to University after a one year HE Access course]
The Uni is in the UK but not my home country iyswim, so I don't have a lot of immediate friends or any family to turn to about this, and we're not that close anyway.
At the beginning of the year I came into contact with a man considerably older than me, [52] on a forum about a mutual hobby, and we exchanged general chitchat before finding out each other's names, ages etc. He seemed very laid back and not at all pushy which was nice, but I was very surprised when he asked my birthday and then commented he'd been a practising lawyer since I was 2!
I'm fairly open minded and it's not the sort of hobby it would be unusual to find a mix of ages interested in [cooking related] so it didn't phase me and we continued to exchange very casual messages, first on the forum but after on the KiK messaging app.
All continued as usual, he would usually initiate messaging and I'm not always the fastest to reply but we would have normal conversations, what we had for tea, what was good on netflix etc, but nothing deep or revealing. He once mentioned that maybe we should meet up at some point but I told him I was too focused on University having finally got to this point and didn't think I would have time during my breaks as I usually fly home and spend time with my family.
Until today, when by chance I check the app and see I have three unread messages from him.
The first said: "I've booked a bit of time off over the weekend, how about I make that visit we spoke about?" (We!?)
The second message, sent an hour after the first said: "I'll have a look at flights, and let you know if it's reasonable (:"
Fourty minutes after the second message, he sent: "All done and booked! Premier Inn for Saturday night, best get a move on and book a place for dinner Missy!"

Now, I'm diagnosed with Asperger Syndrome and thus do admit I have a diminished awareness at times regarding social situations, but reading back every message we've exchanged I can't fathom how I have led him on in any way, or hinted that I wanted a relationship with his man. I have always been polite, jokey but not flirtatious, I wouldn't even really know how to start flirting with someone!
He has never called me 'Missy' or acted this strangely before so I thought perhaps he had messaged the wrong person, but after asking him if he was serious it seems he actually -has- on a mad whim booked a hotel, presumably just for him, but worst case scenario he expects to get me in it, doesn't he?
I've spent hours laying in bed now trying to draft a succinct but not unkind message that will get me out of this, I already have plans on the weekend and even if I was free, I don't think I would feel comfortable on a date with a 52 year old, he's older than my own father. It just feels very forced and like maybe he thinks I'll just go along with it?
If anyone wiser than me can come up with something, I'd be incredibly grateful. I was pretty sure he was just a genuine friendly person, but surely him booking a stay in a town he's never been to before, in a country he's never set foot in, to meet a 22 year old vulnerable adult is a red flag?