Raj wrote:

… not sure of the title but the opening words are “I don’t know why I love u but I do”. Now if u find me this then I will say u r a music wizard.

Brian wrote:

‘But I Do’ was a single released in 1976 and went to number 9 on the Springbok Radio Charts and is currently available on “12 Greatest Hits Of Richard Jon Smith” (EMI, catalogue number CDBU (WCPB) 522, released in 2010)

Available at Kalahari.net

Originally by Clarence ‘Frogman’ Henry in 1961, titled  ‘(I Don’t Know Why) But I Do