494. The will to share a community of life is gravely undermined particularly(1) where proof of an accumulation of facts making the continuation of community of life hardly tolerable is adduced by the spouses or either of them;
(2) where, at the time of the application, the spouses are living apart;
(3) where either spouse has seriously failed to perform an obligation resulting from the marriage; however, the spouse may not invoke his or her own failure.