Did I over step my boundry?

Cinthya • Baby dust to all the soon to be mothers. Only used depo twice and been off of it for 7 months trying to conceive ✨🐣
Yesterday my boyfriend went to his sons school to add his information at the office, we were at home and he was all like "come on babe we have things to do" so we drove there, he parked, I grabbed my purse and he looked at me and asked me "oh you're coming inside with me?" .. Like what? Why are you asking me when you had me get ready.. I got mad and we argued for a bit then we went inside and he did what he had to do. I didn't speak, I didn't ask questions. I only wanted to go in since he had already said we had things to do.. Was it wrong? I mean I would understand a parent teacher conference, or stuff like that .. But at the moment I didnt think it was out of the ordinary. I'm about to be his wife. What's wrong with me coming inside