Simple misunderstanding but just as I went to slam on the brakes
In the last couple of lines he’s been playing on DJ terms, “cut” and the homophone of “*break”.
He didn’t forget her birthday on purpose, but even though it was an accident, she blew up on him anyway.
This leads in to the next line and his wondering confusing about how crazy she actually is.
Pressing on the brakes, stops one’s course, this could be metaphorical for what he’s trying to do in this loving relationship.
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