I'd like to know whether and how "but now to V" is correctly used in the following.
In your example, the context would have to be that the other person has been interrupting you by constantly saying that you never really loved her, you only thought you did. You may have tried to argue about this, but now - because you want to finish the story - to reluctantly and grudgingly say that you will allow "or thought you did" to be inserted into your story.