A man who beat up his girlfriend after an attempt at reconciliation failed has been sentenced to a year behind bars.The defendant, Robert Justin Luna, 30, entered a guilty plea before Circuit Court Judge Bart Stanley to the reduced charge of assault. He was directed to serve his 11-month, 29-day sentence for the misdemeanor at 75 percent, meaning he will be required to serve nine months before theoretically being given probation. He was originally charged with aggravated assault, a crime that would have cost him three to six years in prison.According to the victim, the couple had been sitting in a car together for hours, trying to work out their problems.