Matt Hardy -- Ex-WWE Star Cops Plea in Domestic Violence Case ... I Promise I'll Be Good!

Former WWE superstar Matt Hardy just played a round of legal "Let's Make a Deal" in Virginia -- stay out of trouble for 2 full years ... and you won't go to jail for beating up your wife.

Hardy and his wife Reby Sky have each pled "No Contest" to assault and battery charges stemming from a violent domestic altercation at a Virginia motel back in January ... in which both Matt and Reby emerged bloody and bruised.

Law enforcement sources tell us ... in exchange for the pair of "no contest" pleas, Hardy and Sky are required to complete an anger management course, pay some court fees and stay out of trouble for 2 years ... and the case will be dismissed.

As for the marriage ... we're told Matt and Reby are still together and plan on staying that way.