And I said that's fine
But you're the only one that knows I lied

from Ed Sheeran – U.N.I. Lyrics on Rap Genius

Meaning

he acted like he was okay with the break-up but both him and his ex-girlfriend knew that he didn’t want to end things even though it was for the better.

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And I said that's fine But you're the only one that knows I lied

And I said that's fine
But you're the only one that knows I lied