They had different ideas.
Affectionate and respectful to the end of Lee's life. It was other Confederates who blamed Longstreet for the defeat at Gettysburg, not Lee himself.
James Longstreet
In a 1893 newspaper article former Confederate Lieutenant General James Longstreet evaluated General Lee in two major categories. One was Lee's effectiveness when fighting on the defense and the other was Lee's performance on the offense. Longstreet said that Lee was "perfect" when leading a defensive battle. Longstreet was less enthusiastic on Lee's offensive abilities. There Longstreet politely said that Lee was not a "master in offensive battles".
Yes, Longstreet was Lee's second in command of the Army of Northern Virginia (CSA)
Yes, Longstreet and Lee worked together at Antietam, although Longstreet was subordinate to Lee. He commanded one of the two army corps of the Army of Northern Virginia present at the battle.
It marked the end of the Battle of Gettysburg - the failure of Lee's second and last attempt to invade the North, and a big psychological blow to the Confederates, with signs of disagreement between Lee and his faithful second-in-command James Longstreet. Lee would be kept on the defensive from then on, never again able to execute his famous bold aggressive thrusts, and his health starting to fail too.
jackson and longstreet
The disagreement began over which location to use in order to pursue the Union troops. They, then, disagreed over whether to use an offensive or defensive strategy. Lee wanted to offensively attack Cemetery Ridge, while Longstreet wanted to defensively flank the Union Army and force an attack.
His commander was General Robert E. Lee
That was the nickname for General Longstreet.
Confederate General Robert E. Lee has plans for the Spring of 1864. His goal was to give whatever aid he could to General Longstreet, and have Longstreet invade Kentucky. Lee believed that the operation would take the Federals by surprise. Once in Kentucky Longstreet could supply himself.Lee also believed that Longstreet could cut General Grant's communication lines. To be able to move quickly, he envisioned that Longstreet could move faster if he placed infantrymen on horseback.
James Longstreet is Robert E Lee's most trusted advisor. "General James Longstreet had become Lee's most trusted commander after Jackson's death. Longstreet warned Lee that the Union Positions were too strong to attack." The last part might not help you any, but it helped answer my question.