Johnny Manziel struck a deal with prosecutors in his domestic violence case -- in which he needs to keep his nose clean for a year and seek treatment ... and the case will be dismissed.
Manziel was charged with misdemeanor assault for a January 2016 incident involving his ex-girlfriend, Colleen Crowley, in which he allegedly struck her during a heated argument.
The Dallas County Criminal District Attorney's Office says the ex-NFL star has agreed to a "Conditional Dismissal Agreement."
The agreement spells out a number of conditions Manziel needs to live up to over the next year .