Initially you might be inclined to say that they did get along. However if you look more closely you can see that all the effort put into any attempt at a friendship came from Ralph. Jack's initial reaction on joining the meeting of boys was to try and install himself as leader. Ralph, who won the vote, offer an olive branch in the form of allowing Jack to lead the choir. Ralph invited Jack to join him in the exploration of the mountain. On their return Jack undermined Ralph's statement that there was no snake-thing by stating that if there were one he'd hunt and kill it. The superficially friendly nature of the two boys was entirely one sided. Ralph made an effort because he genuinely liked and admired Jack. Jack however did not reciprocate, he merely bided his time until he could get what he wanted, Ralph's position as leader.
Ralph and Jack never liked each other. Once they met and Jack wanted to take the power from Ralph there was instant friction between the two. It's was obviously Ralph's job to be chief and Jack just expected to get it instead of Ralph.
Ralph, Jack and Roger search the island and climb the mountain in their search for "the beast."
Early in the novel Ralph, Jack and Simon climb the mountain to ascertain if they are actually on an island. Later in the book Ralph, Jack and Roger climb the mountain in search of the beast.
Jack made no reply to Ralph's question and when Ralph turned away and led the boys towards the mountain Jack was at the back of the bunch glowering and brooding.
Ralph told Samneric that he would hide out in the bushes, so eventually Samneric squeal on Ralph to Jack.
Jack challenged Ralph to go up the mountain to look for the beast with him in the dark. Ralph responds by accepting the challenge and bringing Roger along with him.
Jack challenged Ralph to go up the mountain to look for the beast with him in the dark. Ralph responds by accepting the challenge and bringing Roger along with him.
Ralph agreed to go with Jack because he was showing Jack he wasn't scared to kill the beast. Jack taunted Ralph and so Jack didn't feel like he had won he agreed to go with ease.
During the confrontation on the causeway leading to Castle Rock Ralph first called Jack a "Thief" and later when his temper was pushed beyond breaking point he screamed at Jack, "You're a beast, and a swine and a bloody, bloody thief!""
During the meeting when Jack talks of hunting the beast Ralph describes Jack's hunters as, "boys armed with sticks." Later, during the confrontation at Castle Rock, Ralph calls Jack a Thief.
Piggy concludes that Jack does not like him or Ralph, and sees them as obstacles to his authority and leadership on the island. He believes Jack views him and Ralph as weak and inferior to himself.
Jack and his tribe.