The speaker is hurt and angry after seeing a former lover with someone else. He suspects that money influenced the breakup, and he uses a blunt insult to express both rejection and heartbreak. As the song develops, his confident, mocking tone gives way to vulnerability: he admits that he still loves the person, even while saying he hates them.
The โchange in my pocketโ represents having little money, while the Ferrari and the comparison between an Xbox and an Atari suggest that he feels outmatched by a richer rival. Calling the former lover a โgold-diggerโ implies that she values wealth more than affection, though this is the speakerโs accusation, not an established fact. โPain in my chestโ is a familiar way to describe emotional suffering rather than necessarily a physical injury.
The repeated insult can sound like a final dismissal, but the songโs softer admissions complicate that reading. The speaker may be trying to protect his pride by turning sadness into humor and anger; his claim that he wishes the couple well sits uneasily beside his insults. The line about still loving the former lover makes clear that the breakup has not emotionally settled for him.