I always thought it was sad
The way we act like strangers
After all that we had
We act like we had never met

from The xx – Sunset Lyrics on Rap Genius

Meaning

After a relationship has ended the sad reality sets in that you and the person will never be able to view the other the same way ever again. The person they are after a relationship has ended will always be different from the person you knew when you were together.

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