Mike and Bonnie both thought Kenny was loosing it and didn't want to stick around but Bonnie had a thing for Luke so she wouldn't have left … moreif Luke was still alive unless he went with them which I doubt he would since he obviously cares about Clementine (if you choose to help Luke he dies protecting Clementine) and he has a thing for Jane so he cared about her too so I doubt he would leave them behind and if he wouldn't go then I don't think Bonnie would want to as well and then Mike wouldn't have left too:p
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Uhm no... They didnt want to go north, because it was suicidal and they knew Kenny wouldnt let them use the car.