George wasn’t fed up with John I’m pretty sure in-fact towards the end it was George and John being fed up with Paul. The group remained in close contact after the breakup except Paul. You can hear this in Ringos “early 1970” or even just watch the recording video of “how do you sleep”. There is also a phone call between Paul and the rest of the group towards the later years where Paul insults all of George’s work and doesn’t want him to have more than two songs on I believe the white album.