You are not responsible for your partner’s triggers. And your partner, nor anyone else, is not responsible for yours.
Each of us as adults, are responsible for our own triggers.
We need to learn to differentiate between what is present reality and when we are unconsciously receiving our experience through our past experiences in a triggered way.
We can learn to be sensitive, caring and understanding about what might trigger others in our relationships, but at the end of the day, if they get triggered, it is because that trigger was already there inside them.
It is their responsibility.
We are each responsible for our own conduct, not anyone else’s.