I would agree with Milla here. In fact, though this may be too extreme for some to go along with, I think it's a good idea to think of this as your "only shot". If you approach marriage from the standpoint of this being the only chance you get, you'll probably be more careful and cautious. Above all, as Milla said don't base marriage primarily on being "in love". There is a chemical reaction that takes place in the body when you are "in love," thus the reason that it feels so wonderful. But this does not always happen (dry periods), nor does it always continue forever ("falling out of love"). I think the idea that "love" is a new concept and was essentially invented only a few hundred years ago by writers is not really accurate, but whatever the case, it wasn't until recently that "love" itself, for normal people, was considered a good enough reason to get married. We are at the point in society-- materially, socially, psychologically, etc.--where we can essentially pick and choose based on reasons that are not always the best, and without much thought about the consequences 5 or 10 years from now.
Anyway, I hope my last post and this one do not come off as having a negative view of marriage. In the past I have made posts in just the opposite tone, making marriage seem like one of the most wonderful things in the world (because it can be). But I think it's important to be realistic when you are thinking about marriage, and not optimistic. Optimism is for after the wedding--because it will help get you through the days, weeks, months, years, and decades of dry spots, arguments, bad meat loaf, smelly undone laundry, hair in the tub, toilet seat up again, etc. 
Just appreciate her willingness to give, and don't start resenting her if all of a sudden she does decide that what she thinks matters.
