Did I do something wrong here and do I have to say sorry to my girlfriend? How can I fix it?

Anonymous
I been dating my girlfriend for 5 onths and she is my very first girlfriend. Well today i went to go hangout with another girl and i went over to her house. My girlfriend wanted to hangout with me and i told her i was my friends house and will go to her house. Then she was like "you dont go over to another girls house without telling me.". Then she wanted to see a pic of the girl when i went ot her house for some reason.

I mean it's my first relationship and i though she might be cool with it. So now what do i do? Say sorry?
Did I do something wrong here and do I have to say sorry to my girlfriend? How can I fix it?
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