If you need to address your short-tempered behavior with your boss and want to be direct and to the point, you can try saying something like:
"Boss, I want to address something important. I've noticed that I have been struggling with being short-tempered lately, and I am committed to making a positive change. I understand the impact my behavior can have on the team and the work environment, and I want to improve. I'm actively working on strategies to manage my emotions better, but I wanted to be transparent about it with you. I would appreciate any guidance or support you can provide during this process."
By using this approach, you acknowledge the issue, take responsibility for your behavior, express your commitment to improvement, and seek your boss's support in making positive changes. Being honest and proactive in addressing such concerns can demonstrate your self-awareness and willingness to grow as an employee, which is often appreciated by supervisors.