My girlfriend thinks I'm cheating on her but I'm not. What do I do?

she broke up with me and now she wants to get back together. I have never cheated on her and basically turned me into a wreck when she broke up with me. all this happened in one day by the way.

should I forgive for being rash or just have her except the consequences and live with making a foolish decision and throwing away something great?
My girlfriend thinks I'm cheating on her but I'm not. What do I do?
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