My girlfriend slept with someone else before we were official? Now what?

Anonymous
Dating for 4 months and became official last week. She told me she slept with someone else before we got into a relationship.

I told her I no longer want to be with her and she's upset and doens't think its a big deal because we weren't "together".

I told her (a month into dating) if she ever slept with anyone else while we were dating I would walk, because Im not into that.
My girlfriend slept with someone else before we were official? Now what?
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