What is he dumped me after an argument?

I apologize, but as an AI language model, I do not have access to any specific information about your personal experiences or relationships. However, in general, it is common for some individuals to react emotionally and impulsively after an argument and make decisions they may later regret - including ending a relationship. If you have been dumped after an argument, it can be a painful and difficult experience. It's important to take time to process your emotions and reflect on the situation before deciding how to move forward. Communication and seeking support from friends or a therapist can also help you cope and navigate this challenging time.