Yes, 'Dear John' can be a common theme in romance novels. It often refers to a letter or situation where a character named John (or a stand - in for a male character) is being left or rejected in some way, which can create a lot of emotional turmoil and drama, a key element in romance novels.
Another novel is 'Letters to a Lost Love' which is not directly named after 'Dear John' but has a similar concept. The protagonist discovers old letters from a past love that were like 'Dear John' letters in a way. These letters open up old wounds and also a chance for him to re - evaluate his past relationship and his current state of being in love.
Well, I think the theme could be sacrifice too. The characters in 'dear john novel' may have to sacrifice their own desires or plans for the sake of love or other important things in their lives. For example, one character might sacrifice a good career opportunity to stay with the person they love. It shows how love can make people give up things they value for the sake of the relationship.
Typically, in a 'dear john' type of novel, there is the central character, John, who is probably at the heart of the story. Then there could be his love interest, let's say her name is Jane for example. There might also be some side characters like John's friends or family members who play important roles in influencing his decisions and actions throughout the story. These side characters can add depth to the main characters' relationships and the overall plot.
Well, 'dear john story' is kind of a classic trope. It's often associated with letters that convey the end of a romantic relationship. You know, like in the old days when soldiers were away at war, and their girlfriends or wives might write a 'dear john' letter to break up with them. It has come to represent any story where there is an unexpected or perhaps even a somewhat cold ending to a relationship. It can be really heart - breaking, both for the person receiving the news and for those who hear about it.