Yeah the one before. Laura Coleman.
Although if you ask Danny and you ask Laura, you'll potentially get two completely different answers as to the seriousness of whatever it was that they had.
There also might have been a bit of overlap with Laura and Danny's previous girlfriend Olivia
Laura ended up marrying one of Danny's mates Joe, who was in The Saturn V. That was a little group of mates Danny formed based around his DJing. I think Danny and Joe fell out over Joe even dating Laura.