IMO, it's not enough to call it quits. Every relationship goes through rough times and it's way too easy to just give up and look for change. Work on it together and find something that will bring back those old days. I'm sure some of those who are/were actually married can give more insight so i'll leave it at that.
-to be nobody but yourself in a world which is doing its best, night and day, to make you everybody else means to fight the hardest battle which any human being can fight; and never stop fighting.- e.e.cummings