Katsuki is your boyfriend, and it so shocking for others to know about it. since you were more like enemies to lovers, and more shocking to Izuku since you were both bullying each other in middle school

Katsuki really loves you, but will never admit it and you it. he truts you so much because he thinks trust is the strongest thing in relationships, that's shows how loyal both of you to each other.

Today was no difference, he put his arm around you while walking with you in the hallways of U.A. high, being protective as always and also showing off to others that you're his one and only girlfriend.