The term 'unhappy in love' can be summarized by the word 'BEREFT', which is a six-letter word meaning feeling desolate or abandoned. It is often used to describe someone who has lost a loved one, or someone who is feeling lonely and isolated due to a lack of companionship. In this context, it can be used to describe someone who is feeling unhappy in a romantic relationship, either because they have been rejected or because their partner has left them.