Every time she proves her points “right” all the emotions come back or reappear for an instant.
The Sun: Might be used to either represent all positive emotions such as love, and the happiness between the couple.
So he is is surprised how all the positive emotions disappear so quickly, when she goes on an emotional outburst.
It might be possible that once they get over each others problems and figure things out, she gonna be the he is gonna be rapping about and not their problems.
In the last couple seconds of the music video, Alc stated while Ev was hitting a bong “I though this was an anti-weed jam” I’m guessing the whole point of the song was to tell the listener that with or with out weed one can still have talent.
In this case, Ev woke up feeling a positive vibe. That feeling was so different and positive that he skipped the daily routine.
He is pretty much mocking her, making it seem likes its not the first time they’ve gone through this situation.
He knows that this time is over and it’s going to hurt him once she leaves.
He’s trying to make it seem like everything she’s doing its nothing, but a big bluff.