1. "You know I love you Bob. I just can't commit right now," she said, sighing faintly.
"Can't commit. I have heard this song before, alright."
2. "You know I love you Bob. I just can't commit right now," she said, sighing faintly.
"Can't commit. Where have I heard this song before?"
Number 2 is better.
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.