In the graveyard at Trenzalore, The Doctor and Clara see River’s gravestone and The Doctor says something to the effect of “my wife’s grave wouldn’t be here.”
HE CALLED HER HIS WIFE.
Even though Eleven acts like this revelation (well it was a revelation to Clara anyway, if not to the viewers) was a slip of the tongue, still…
HE CALLED RIVER HIS WIFE.
To my knowledge, he has NEVER done this before. It was always River who referred to their relationship as a marriage, like in “The Angels Take Manhattan” when she realizes The Doctor is coming and she tells the guy holding her captive “Just wait till my husband comes home.”
The even more poignant aspect of this was that he did it IN FRONT of River. Because, as he indicates later on in their scene in the tomb, he knew she was there from the start - could see her even though River believed he couldn’t - but avoided speaking to her because it would’ve hurt him too much.
I feel like…YES, he finally acknowledged their relationship for what it is. Ditto with their scene in the tomb and earlier in the episode when he told Clara River was “much more than a friend.”
This episode reminded me why I am an Eleven/River shipper…cause they have such a great and complex love story. :)