What to do if girlfriend won't talk to me after an argument?

What should I do? I have apologized but she is furious. I didn't cheat on her. But I told her my ex was with me when I started catching feelings for my current girlfriend. I thought she knew about my previous relationship so I never confronted her. She said she doesn't want to talk to me rn. Should I give her this space?
What to do if girlfriend won't talk to me after an argument?
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