I'm a firm believer that couples shouldn't spend every free second they have together. It's important for each person to have other friends, hobbies, and interests.
Not only does it give you time apart (which is a must every once in a while), but it also helps to strengthen each person individually, which in turn makes you stronger as a couple.
So a little time apart is healthy, but what about space? I'm sure you've said you need your space before, if someone was being too clingy or if you were constantly arguing. Can space or taking a break really make a bad relationship better? Or, is saying you need your space just sugar-coating an inevitable break up?