Now we're lying about the nights
Hiding it all behind the smiles

from The Weeknd – The Knowing Lyrics on Rap Genius

The theme continues: Abel knows what she did (cheat), so he decided to do it back (cheat on her) and now it’s known between the two what they’ve each done. So in standard human form, instead of addressing the issue, they will be hiding it behind disingenuous smiles.

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