As .38 Special can tell you, you've got to hold on loosely
. In this song, the guy the has driven Amie off by trying to control her, and now she's with another guy. All this is established in the first verse; he spends the rest of the song trying to get her back, telling her it's different now, and they should give it another chance.
The song was written and sung by Craig Fuller, who along with George Powell handled vocals and string instruments in the group. Fuller has had plenty of chances to make up a story about the real Amie, but he insists that he made the whole thing up as a songwriting exercise, just "stringing words and music together." Amie is a character he created.