Complete waste of time, just nothing but a con job to make people think there was some romance in the game imo. I would like at least some romance dialogue in the next TES game . Are you interested in me , that's it are you kidding me , FAIL FAIL FAIL FAIL FAIL Bethesda.
While I agree that it could do with some expansion (And a marry somebody else option for if your wife is also a follower who falls in battle) this was never intended as a romance option.
Being married gives you an extra resting bonus when you sleep under the same roof as your spouse. Your spouse also becomes a secondary income, as they open up a market stall in the town you base yourselves in. They give you a split of the profits per day and you can sell stuff to them which you've looted.
It's all good.
If however you want some kind of six mod I'm sure the modding community will service your needs soon ebough...
