all interesting responses.
I would think both are viable if
a) the person is a serious and mature believer.
b) currently lives a life of abstinence, and has done for a reasonable amount of time, because they want to be pleasing to the Lord.
c)if children are involved - their current mental health, feelings and wishes are taken into account. (Whatever the reason the person is a single parent, the child will have been affected by it regardless. (I would rather be lonely than become a stumbling block or source of pain- especially to a child!)
d)their ex (spouse? assuming they were married) is not trying to reconcile. In such a case it would be wise to ensure there is a good reason for the divorce and for not reconciling, and that the decision is permanent and unlikely to change down the line.