After an argument with my female friend I had a mutual friend reach out to her and she said she's hurt more than anything. What should I do?

This female friend has been very close to me for 15+ years and we have grown to have feelings for eachother but she is in a serious relationship. Basically what the argument was about. After telling our mutual friend she's more hurt than anything what should I do? Give her, her space for a while or reach out and tell her I never ment to hurt her?

After an argument with my female friend I had a mutual friend reach out to her and she said she's hurt more than anything. What should I do?
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