 " Unfaithful " received mixed to positive reviews from critics ; many praised its powerful balladry , but some criticized the lyrics . The song reached the top ten on the singles charts in 19 countries , including the UK Singles Chart , on which it became Rihanna 's third top @-@ ten single . " Unfaithful " peaked at number six on the US Billboard Hot 100 chart . It was certified platinum by the Recording Industry Association of America ( RIAA ) , denoting shipments of over one million copies . 
