"In short the two people who love you most in all this world."
You can see the very moment John registers that Sherlock just told him that he loved him.
those are tears in his eyes
I know that we’ve written hundreds and hundreds of metas on HLV, but just… look for a moment, at Amanda’s mouth. She is a brilliant actress. She knows how to move her face, how to convey a message. Let’s stop focusing for a second on John reevaluating his life choices, and take a look at her. She is smiling, she is listening to Sherlock, “oh such a lovely speech it tis…” and then he says “in short the two people who love you most in all this world.” and she looks up….. and she sees Sherlock, NOT John, and her smile falls. She knows that this isn’t about her anymore. In fact it never was. She knows in that moment, that this was a fond farewell, from Sherlock to John. She knows that this is a goodbye, and that she is the accidental cause. She fell in love with John, and she got him through Sherlock’s death, and hell, she got him through his return… but she just now, after all these months with Sherlock alive and back, she just now can see just how much, how truly, how completely this man loves her Husband… and she falters.