It's unfortunate that your girlfriend dumped you, but it's important to recognize that there could be several reasons for her reaction beyond just the statement about diamonds being made of carbon and having no "real use." Here are some potential factors that may have influenced her decision:
Insensitivity: Your statement about diamonds lacking real use might have come across as dismissive or insensitive if she attached sentimental value or significance to diamonds or jewelry in general. She might have felt that you didn't value her feelings or interests.
Communication: Communication is crucial in a relationship. If this statement was part of a larger pattern of poor communication or lack of understanding, it could have contributed to her decision.
Different values: People in a relationship often have different values and interests. If she places importance on material things like jewelry and you don't, this difference could have been a point of contention for her.
Context: The way the statement was made or the context in which it was said could have played a role. If it was said dismissively during an argument or in a condescending manner, it could have hurt her feelings.
Emotional response: It's possible that this statement served as a trigger for other underlying issues or emotions she had been feeling in the relationship. Sometimes, a seemingly insignificant event can be the tipping point for someone who has been contemplating a breakup.
Compatibility: Incompatibility in general interests, values, or communication styles might have become evident through this incident.
Accumulation of issues: This statement might have been just one of many contributing factors to her decision, and it could be that the relationship had other challenges that led to the breakup.
Ultimately, it's essential to communicate openly and honestly in relationships and to be respectful of each other's feelings and perspectives. If the breakup has left you feeling confused or hurt, it may be helpful to reflect on the relationship and consider seeking support from friends, family, or a professional counselor to process your emotions and experiences.