How do I become less aggressive?

A little about me. .
I'm logical, assertive and empathetic, but I do have an aggressive side that makes me a bit rude sometimes when I'm triggered in specific ways. And when I'm generally in a bad mood I'm more likely to be rude if triggered.
My fiance is sensitive to that and sinse she is dealing with me often she's experiencing more and more of my rudeness. I respect her immensely and I always feel terrible embarrassing her with my rudeness. It's a serious issue I'm having and I need to get over myself and become resistant to these triggers.
Any ideas how to do that?

How do I become less aggressive?
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