Actually I was going to say ‘Not The Four Tops’ as I thought they had the Motown hit. Wikipedia reminded me it was the Detroit Spinners.
I was astonished to see what the song is about, as I thought of it as a catchy tune with a memorable chorus. According to wikipedia it’s:
About a man who cheated on his girlfriend and emotionally abused her. When she leaves, he realises that he did love her, is very remorseful about his actions, and vows to win her love back.