For couples who want to dissolve their union or live apart, there are two options: legal separation and annulment. A legal separation allows a couple to divide their properties and live apart, but it does not dissolve their marriage, i.e., they cannot re-marry. In annulments and declaration of nullity of marriage, you have to prove that the marriage was invalid from the start according to a certain set of reasons such as impotence, homosexuality, mistaken identity, or psychological incapacity, among others.
Both are options are flawed. In legal separations, everything but the marriage is dissolved. Quite literally, the couple remains married only on paper. In an annulment, you must prove that your reason for wanting to nullify the marriage existed even before the marriage--this requires one to declare and prove that his or her partner is incapable of functioning as wife or husband.
The idea of couples wanting to end their marriages is not a new to Filipinos. As women’s rights advocate Beth Angsioco wrote in her column, "We already have laws for those who only want property settlement, and those with void and voidable marriages. Why not a law for valid but failed marriages?"
http://www.femalenetwork.com/news-features/9-reasons-to-support-the-legalization-of-divorce-in-the-philippines/