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I Should Have Known Better" was a UK number one single for one week in December 1984 for Jim Diamond. The song was displaced after one week by  Frankie Goes to Hollywood's song " The Power of Love". Diamond publicly requested that people not buy his single, but instead buy " Do They Know It's Christmas?" 
"I Should Have Known Better" was re-recorded for Diamond's 1993 solo album
. He recorded the song a third time for his 2005 single "Blue Shoes", which also featured a re-recording of " Jim Diamond I Won't Let You Down" and covers of old soul songs such as " My Girl".
Australia (Kent Music Report)
Dutch Top 40
German Singles Chart
New Zealand Singles Chart
Norwegian Singles Chart
Swiss Singles Chart
UK Singles Chart
Cover versions [ edit ]
The song was
covered in French by Julie Pietri ("À force de toi"). It was also covered in Italian by Matteo Becucci ("Lo avrei dovuto sapere"), as part of a compilation that showcases the contestants of The X-Factor Italia's second season. The Spanish version of the song "Te Veo Pasar" was covered by Yolandita Monge in her album Luz de Luna.