Suggestion:
Save game before you marry her(or him).
Marry, and enjoy the wedding
Go to your house(preferably a house where you don't live on top of eachother(you know what I mean

. Have your own space so to speak.
Take time off from adventuring. Have a romantic and peaceful honeymoon where you avoid big quests for a while. Except for the ocational romantic stroll in the woods with your loved one, where you can kill rabbits and foxes and share meat and pelts. Eat lots af great dinners with beef and salmon and whatnot, talk and read some books together and don't forget sleep well together.
Do this a couple of days, and I will guarantee you that you will know if this the ONE. If you are dissapointed, reload the save. In this way there's no dungeons or ruins that you have to do again if you choose to reload.
Happy wedding!