 In Europe , " Unfaithful " reached the top ten in 14 countries . The song was most successful in Hungary and Switzerland where it reached number one on both nation 's singles charts , and became Rihanna 's first single to reach number one on both charts . " Unfaithful " was certified gold by the International Federation of the Phonographic Industry ( IFPI ) – Switzerland for shipping over 15 @,@ 000 paid downloads in the country . In Norway , the song entered the national singles chart at number 18 and after six weeks it peaked at number two , where it stayed for two weeks . " Unfaithful " entered the Austrian singles chart at number eight on August 18 , 2006 , peaked at number two and stayed on the chart for 27 weeks . The single reached number two in Germany and the Republic of Ireland , number three in Denmark , Belgium ( Flanders ) and the Czech Republic , number five in Slovakia , number six in Sweden , number seven in France and number nine in Netherlands . On the UK Singles Chart , the song debuted at number 16 on July 22 , 2006 , and the next week , it peaked at number two . " Unfaithful " re @-@ entered the chart in both 2010 and 2011 , when it reached numbers 31 and 50 respectively . More than 315 @,@ 000 copies of the song have been sold in the UK . 
