Marriage And Divorce In Islam

marriage and divorce in islam
What are the grounds of which women can divorce men in Islam?

My friend has married a man and has consumated the marriage once. It has been over a year since they have been together as he lives in another country. Since then she has fallen in love with someone else and wants to divorce her husband. How can she do this ans what does Islam say about this?
She lives in the UK, and just does not love her husband.

tell her the prophet once divorced a woman from her husband for that very reason.she will find it in bukhari,sahih muslim.