Refusing A Pupil, how to? Options

[bebohblah]

First post on here so a bit nervous but hope you might be able to help... (IMG:style_emoticons/default/huh.gif)

A month or so ago I had an enquiry .. usual type of thing, normal conversation, questions as you would expect about taking on piano lessons for himself... but the end of the phone ended rather strangely with him calling me 'darlin'.. at which point I was slightly taken aback but we'd already arranged a lesson. The day comes of the lesson and he's a no show... i'm slightly relieved!

A couple of weeks later (just before xmas) I get another phone call apologising for the no show and saying his car had broken down... I said to call me in the new year to arrange another lesson, but then again an innappropriate comment of 'i'll take you out for a drink to make it up to you' !!!

Alarm bells went off and i was polite and said 'that's ok, just ring in the new year'.
Several rather familiar texts later (that i ignored), I now definitely do no want to take him on and am nervous about answering the phone to him!

I'm sure people will have come across people that they were not sure about taking on as pupils, but this is my first experience of someone thinking it was more than just a teacher pupil thing! How do I now tell him that I can't take him on? Any advice on whether to ignore his next call or what to do next would be greatly appreciated.