MAYBE she's kept the number so that she knows to ignore it when it shows up on Caller ID? Changing the name to a girls name so as not to worry you, if and when this guy tries to contact her again?

The way you gotta look at it is this, the chances are she's doing it to protect you and to avoid a jealous argument. If you're jealous anyway, she's already won.

Unless her names Claire and she's from Southampton, then she's been getting it from me for years, boyfriend or not