The pair, who met while filming the music video for 'Like I Can', confirmed they were an item at the end of last year, before spending New Year together in Australia, reported Daily Mirror.
But Smith, who had previously spoken out about how happy his new man made him, hinted it was over when he took to the stage in Toronto.
He introduced his break-up track 'Good Thing' by saying, "This song is very special for me today, as I've actually had to do a very similar thing with someone I've been seeing."