Technically, I'm single. Emotionally, I'm taken because in my heart, I'll always be his girl even if he doesn't know at all.

And that's true. You may not see it, but it's true. You may not suspect it, but it's true. 
You may not be able to imagine it, but it's true. You may not have guessed it, but it's true. 
You may not accept it, but it's true.