Why not do a 180... send him a normal chatty email, say you're surprised he wants to do that, doesnt he have his own credit card? Can he not get a loan, or borrow it from family? And then maybe say, you would prefer to keep things simple, by not adding to this debt (and having to apportion the monthly interest payments, like x to him, cos he added this to the total).. so could he do everything he can to try and raise the money elsewhere? That way, you are saying no, but in a friendly reasonable way.

But maybe I am just crap at boundaries, as I probably would've just said yeah ok ! Hows things anyway? What happened after the date/snog the other day?? Seeing him again? (nose, snoop, probe... etc)

Al xxx