Marriage is really pointless unless there is a good reason for it - children, financial partnership, taxes, etc. If you have a bad relationship, a marriage won't save it. If you have an OK gig but it could be better, being married might give you the incentive you need to work through whatever issues there might be. And if after 5 or 10 years you're still in love with the same person, then flip a coin - since it doesn't matter then either - you're hooked and so is she.