I stumbled upon Janessa (sp?) and picked her. Instead I played with her for a bit on a few quests. So when it came the time I couldn't bring myself to it, so I picked that mage guy. After playing with her more we became perfect warriors.
Then when we were searching for the dragon priest masks, we were in an exceptionally hard room with a draugr death overlord. It became clear to me that it was very hard but we got there in the end. When we were finished I went looking for her only to find her lifeless corpse surrounded with about 10 draugr bodies. I swore to all gods that I would kill all draugr and never marry as I realised that I loved her.
And to this day I still combat draugr with that insane fury for revenge. Infact A few times I went berserk and killed my followers.
Its things like that that make skyrim amazing and show how RPing is a major upside.
I can only hope that dawngaurd brings moments like that.