How can I prove to my ex friend I didn't sleep with her ex boyfriend?

Well it's correct that he did cheat with me, she has one part wrong. We never slept. We made out and exchanged some texts involving our written fantasies.

I know that was still wrong and it would mean a lot if I can regain her friendship. She's assuming the worst. She really thinks we had sex. We didn't. We did kissed though.

How can I prove to my ex friend I didn't sleep with her ex boyfriend?
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