I don't think so. The novel and the game are separate entities that can complement each other. The novel usually doesn't have a negative impact on the enjoyment of the game.
Not at all. Romance novels are a way for people to escape and enjoy a fantasy. Marriages are ruined by real issues like communication breakdown, lack of trust, and incompatible values, not by novels.
Poor character development can really ruin a novel. If the characters are one-dimensional or their actions don't make sense, it can turn readers off. Also, inconsistent writing style or grammar mistakes can detract from the reading experience.
I don't think so. Reading romance novels can actually give you some ideas and expectations about love, but it doesn't mean it'll ruin your actual experiences. Your real relationships depend more on how you interact and communicate with others in the real world.