She can file a petition for divorce if she can show the court that the marriage has irretrievably broken down. This means that either one or both of you feel that you cannot stay married to each other. Either of them may apply to the court for the marriage to be dissolved as long as they have been married for one year at least and that one of them has been a resident in the UK for the year before application is made.
She will also need to prove one of the five following facts:
a) Adultery within last 6 months
b) Unreasonable behavior within last 6 months
The other spouse has behaved in such a way that she cannot reasonably be expected to live with him. This covers all sorts of bad behavior.
Her husband deserted her for a period of more than two years. Desertion means leaving your husband or wife without his or her agreement and without good reason.
d) Two years' separation with consent of other spouse.
e) Five years' separation if no consent from other spouse.
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