Agree with OG. At least she wasn't' lying (apparently; she might have been). She may have been attempting to get him more interested, by telling him he'd got competition.
Being stood up is common enough, and a lie may be told as a diplomatic excuse. I once tried to date a previous date, not seen for a while, and she told me I was ringing during her wedding reception. Now, if that was a lie, it was a good'un. Wonder how she faked the party noises and champagne opening that I could hear in the background ?