how to be supportive to my partner? (need some advice)

i (20) and my partner (22) both have CPTSD, recently i learned some things about what they struggle with a lot.

but today i accidentally triggered the hell out of them, and i am afraid i have made them feel like i am going to treat them like how they were treated when they were younger.

i never would, i reiterated that i never would again. but i know i broke their trust.

they aren't mad at me, and i'm not mad at them. i just am worried that i have strained our relationship and i don't want to make them feel like that.

i am giving them space, i just want some advice for the future. i love my partner so much that even though it was incredibly accidental and unintentional. i just want to make sure my partner feels safe with me again.

and i don't know how to do that.

any advice?