What's the difference of holding my frame and having a huge ego? Cuz everytime I'm trying to hold my frame or stick to my word, my ex always keep saying i have a huge ego.

E.g. when we having plan she want to change it but i told her "no we should stick to my plan, next time we will do your plan not now" or when we arguing if it's my fault ofcourse i would say sorry but if it's her fault i never say sorry to her.

About a huge fight and before the break up, i told her it's done and don't talk or contact me anymore unless it's a work related(she is my coworker) last word she said "f*** you and your ego"

Now I'm questioning my self maybe i just misunderstood the meaning of holding your frame and having a huge ego cuz for me I'm just holding what i believe and I'm holding my word , i don't feel it's about my ego.