what is he trying to do?

[drobs]

I read your other thread. Is this guy in Turkey or England?

Either way - you're stuck since you're not Out.
If I was you and had a guy flirting or "fake flirting" with me, I'd flirt back. I'd also let him know that...
1. I'm Gay.
2. I find him attractive.
3. I'd tell him to be careful as... he's turning me/you on.

If you're away from home and in England - maybe this is the time you finally enjoy some freedom. Be Gay. Enjoy it for now.

OR...

Be creepy - play a game of Gay Chicken, sit in his lap at weird intervals during the day, flame out a little. Do the yawn, put your arm around his shoulder - move while sitting on a couch - give him long hugs - put your crotch into it, and laugh it off like straight men do...

He's making you feel uncomfortable, maybe you should return the favor. Invite him over to your place before going out for a drink. Show up at the door in your boxers and have him to pick out your outfit...