Didn’t Tyrion get married with Sansa? So he’s still king of the north ?

Yeah, except this never really flew with me, because this is never actually explained. We assume that it happened, given Sansa's subsequent union with Ramsay, but how it actually happens is a little confusing to me. Sansa and Tyrion had a legally binding marriage, so when she arrives at the Aerie, they are still officially married, whether said relationship had been consummated or not.

I may be seeing too much into the technical or legal details here, but the idea that the marriage is annulled just by Sansa marrying Ramsay before the Old Gods (when she had married Tyrion before the Seven) doesn't make sense to me. I would think that either Sansa or Tyrion would have had to have formally requested an annulment from somebody really official (like the High Septon, or someone of that ilk). And given that both of them are on the run, how would that have happened?

But I'm a Sansrion girl. I had kinda hoped that the two of them would get back together at the end.