SUBREDDIT: r/relationships
TITLE: Me [23M] with my partner [24F] 1 month, didn't take her serious
POST: Hello, this morning my partner shared one of her insecurities with me. She was in the shower and asked me to do something (in a specific way). I didnt think much about it. Later she told me she doesnt like telling people what to do (it makes her feel insecure). Instead of getting it, I replied asking her then why she asks me/others to do something. Obviously she had meant she did not like feeling insecure after asking, rather than not wanting to ask for a favor/ giving an instruction. 

Basically she felt ignored and didn't feel well about it all day at work. She came home a while ago and has left the house since then. She needs to be alone. I dont think she feels well.

What is an appropriate response? I feel like shit and I have no idea how to go about this.
TL;DR: 
I (not knowingly) upset my girlfriend, its been bothering her subconsciously all day and now she's gone off to be alone. How to treat her and the situation?