I made my girlfriend cry?

Anonymous
To start off, I'm a guy.
A while ago some guy called my girlfriend while she was in the shower. It was nearly midnight so I looked. I confess that I get quite jealous so when she got out of the shower I was quite off and just said "****** called you". She looked shocked and a bit confused as she checked her phone. And then she explained.

We talked for about an hour and I told her that I feel like there are new guy names popping up all the time. She said they aren't new, she just doesn't talk about the people she generally doesn't hang out with anymore. The guy that called her is a guy that has had a crush on her for a long time and won't leave her alone.

I was stupid enough to bring up something that we've already discussed, about her guy friends and one in particular. She then said sarcastically "I can always chain myself up here and never leave the house". I got upset and when she noticed she apologised and said it was a stupid joke, she hugged me and started to cry, apologising over and over.
I'm worried she actually feels this way. What do I do? Was I wrong to react the way I did?
I made my girlfriend cry?
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