What strategies can I use to stay calm during arguments with my girlfriend?

I'm a 20-year-old male, and my girlfriend, who is 18, and I have been arguing more frequently lately, despite being together for three years. She has mentioned that she doesn’t appreciate my tone during our disagreements, which I completely understand. However, I don’t always recognize when I'm being rude or dismissive in the moment. I want to be able to remain calm and truly listen to her, but I often find myself feeling defensive. If anyone has any tips on how to manage this, I would greatly appreciate it. TL;DR: Seeking advice on how to stay calm during arguments.