Marriages are starting to be like school loans and with 50% of marriages now ending in divorce it seems like couples should look at big picture finances and get away from running in blindly to "traditional" relationships. Best word of caution for saving and keeping good credit going into a relationship I've ever heard is pretty simple. To keep your good credit score intact, keep your finances separate from your partner or spouse.
By keeping separate finances, if things don't work out (and of course we only wish every couple the best, right?) then they won't spend the next 5 years trying to separate themselves financially. And even more importantly, a disgruntled ex won't be able to take one last shot and ruin their ex.'s good credit.