Quick potted history. With boyfriend 9 months. Not that serious but we had had the exclusive talk. Met on a dating site.
About a month ago had a feeling something wasn't right. Few nights he was supposed to be here and cancelled for dopey reasons that set my spidey sense tingling.
Looked on the dating site and lo and beholdy there is was, active, having logged in in the last 24 hours.
But I am not as stupid as he thinks I am.
I set up a profile called thisblokeliesandcheats (it's been taken down) with all his details except photo and spelled out what he'd done (thanks whoever that was who suggested that one) and I will probably do it again
At this point he's said he's coming here Thursday night to stop for the weekend (he doesn't work Friday)
BUT he has also arranged to meet "Anna" off the dating site at a lovely new restaurant for lunch on the Friday about an hour away from here (half an hour from his house)
Obviously, I am Anna.
So, how long do I keep this going. My teeth are itching I want to tell him so much 
Am also a little upset, but I had nothing invested in the relationship, so my pride has taken a hit and I feel a bit of a mug but other than that am grand.