A break dating
(Ironically, this may imply that couples may find it easier to reconcile after a "permanent" separation—one with no set ending date—than after a temporary one, especially if one or both partners saw other people in the meantime, simply because with the permanent separation there is no expectation of reconciliation and less feelings of betrayal to overcome.) Let's learn something from Ross: a "break" is not a "break-up," and if you are in a temporary separation, remember the ultimate goal is to get back together with your partner.
Given that goal, for all intents and purposes you are still involved with that person.
Seriously, you can get a lot of stuff done when you’re not worried about romance.
(The article focuses on marriages, but I think it applies just as well to any committed relationship.) Rather than a preliminary step to the foregone conclusion of divorce, these temporary separations, planned out carefully between partners for a predetermined length of time and with guidelines regarding finances and child care, provide a cooling-off period with the added benefit of allowing the partners to see what life will be like without each other.