What should I do I did something cruel?

Anonymous
So my ex ended up leaving me the week of my birthday then asked another guy out since I refuse to marry her then said she still wanted to be friends. The following week my ex got buzzed with me then we had sex and she told me her true feels she was super affectionate then the next day very cruel. I ask if she told the new guy we had sex and she said none of my business. I know who the guy is everyone said i should tell him but I didn’t.

My ex ended up coming over agin half buzzed got drunk with me we had sex and I called up the new guy on video chat and made him watch us have sex. My ex thinks she was the one who called the guy what should I do? She I confess it was me? Or leave it be.
What should I do I did something cruel?
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