Please, Please, Tell Me Now - A/S/L?

Ladies and Gentlemen, let it be known here and now: I have a ring on the third finger of my left hand. The kind with diamonds. That's right, folks - she's getting married!
I'm very excited by this - my fiance is a lovely man who's my favourite, and my choice for the person I want to spend the rest of my life with.

However, just 'cause I'm engaged, doesn't mean I'm blind. There are still many attractive ppl out there, some of whom I've been known to /gasp! shock!/ flirt with. However, there are some ppl who don't know I'm getting married.

Which brings me to Mel's Lunchtime Ethics Poll: at what point do you have to come clean? I drink coffee with these ppl - we try not to talk about our secret pain, instead opting for some light character assassination of anyone foolish enough not to join us - have the occasional veen-ho, and e-mail them about uni coursework. I've worn the ring around them, but neither I nor them have commented on its sparkly symbolism.

When does it stop being simply a fact that we don't really talk about our relationships, and start moving towards blatant misrepresentation? Is this a new and interesting form of cheating? And, has it been left so long that to say anything would just be creepy?

When is it time to make clear you're taken???