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Aaron Phypers was shocked as he was arrested Friday for alleged domestic violence against Denise Richards ... 'cause he says the last time he spoke to cops, he was reporting HER for similar allegations.

Michael Finley , Aaron's lawyer, tells TMZ … Aaron wasn’t interviewed by authorities prior to having cuffs slapped on him on a felony arrest warrant connected to allegations Denise leveled from 2022.

TMZ broke the story ... Aaron was arrested at the courthouse during a restraining order hearing with Denise ... and subsequently charged with 2 felony counts of injuring a spouse and 2 felony counts of dissuading a witness by force or threat.

As we previously reported ... Aaron filed a report against Denise with the L.A. County Sheriff's Department over the

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