((The specific context of the lie depends on the reader!))

You’ve lied to him. About yourself. About who you were, what you were, what you used to be.

And it wasn't even the fact itself that made Donnie so angry. You’ve been lying to him, FOR SO LONG. And now, everything else felt like a lie too. Because if you managed to fool him, someone who loved and trusted you so much, into thinking you were something you weren't… for so long… Then what was true at this point?

“...Do I even know you at this point?” Donatello asked you quietly, glaring right into your soul.