I do believe there is a back story there - it may be one of those things that were not finished before game release ...
Spoiler I happened upon a relatively interesting thing in a mead hall somewhere, where there is an extremely depressed alcoholic chap who goes on about his 'love' who ran off with someone called 'Vex' ... you can ask around a bit about it, but no quest becomes active, so I don't know ... maybe his love is Vex, who knows!
No no, his love ran away with Vex and the depressed guy, I think, believes that Vex is a guy, which made me think that maybe Vex isn't interested in guys... hahahaha
But yes, I don't jump lightly into marriage. I first have to take the guys out on some adventures, check out their personalities

Now, for some reason, my Nord, Brigid Keltinga, was immediately smitten with Vorstag. What a cutie! Love the voice and OMG have you seen his biceps? They also share the same tattoo! So, yea, love at first sight hahahaha They got married as soon as she bought the house in Whiterun! LOL
Only one guy would do for my Imperial Diana Artorius - Good looking, smart, a bit stuck up, but still willing to help out around the house and in tombs... Marcurio!
Now Morigana will have none of this nonsense. She likes it best when she's by herself (why can't these housecarls just move into their own rooms? *grumble* - Dawnstar Sanctuary FTW) or when she is concealed in shadows, ready to strike down the next enemy!
