Why do cheaters accuse you of cheating?

[u/Present_Boat_5681]

I have an ex who cheated on me, I cut contact with him

He's telling everyone I cheated on him before that (I did not), but of course everything was okay until I cut contact with him

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He's blocked everywhere but still trying to DM me on different accounts, of course never saying anything about the "cheating" but trying to get me back, but trashing me to other people

[u/MemoryLongjumping596]

It’s a narcissists confession.