I kissed my ex's friend?

Anonymous
Sorry this is long. But please read.

Okay so I went out with a guy who was my best friend. We later decided we were better as friends; but we still talked to each other as if we were dating. Recently he told me he still liked me, and I told him I still liked him. After that, I saw him grinding at a dance with my friend. He told me honestly that he enjoyed it, but he didn't want me to be mad. Two nights ago, I kissed his friend. His friend told me to keep it on the down low, so I'm scared to tell my ex... But I kind of want to tell him as revenge (and to be honest) what do I do?
I kissed my ex's friend?
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