This is a simple song activity. I tried to avoid the usual "fill-in the gaps" kind of activity, so, if you have some more time to spend, try to play the song before they read the lyrics, and have them trying to listen how many times they sing "gonna" and "will". Another idea, if they are creative, you can all discuss about the story. What is she going to do about the situation? How is the boyfriend going to react?
If you have any other ideas on how to use this, please share! Thank you very much!