John's relationship with each of the other Beatles was different. He was at his most relaxed with Ringo, who often had him in stitches with his jokes.

I knew the man up until our divorce - after that I didn't know the man, but it didn't stop me caring about him and worrying because of the complete change that I saw in him. He'd lost his sense of humour and he got aggressive; he wasn't for the world any more, he was just for Yoko. Before that he opened his arms and embraced the world with his wit and humour - afterwards he was a completely different kind of person.

When John was with me, it was total commitment. Whatever he did outside our relationship didn't seem very important. We were together such a lot of the time that whatever other affairs he had once we met couldn't have amounted to much because I was with him most of the time. He kept me in Liverpool as late as I dared stay.

John and I weren't capable of getting back to Kenwood from there, so the four of us sat up for the rest of the night as the walls moved, the plants talked, other people looked like ghouls and time stood still. It was horrific: I hated the lack of control and not knowing what was going on or what would happen next.

John was an extraordinary man. Our relationship has shaped much of my life. I have always loved him and never stopped loving him. That’s why I want to tell the real story of the real John – the infuriating, lovable, sometimes cruel, funny, talented and needy man who made such an impact on the world. John believed in the truth and he would want nothing less.

John asked me to dance and I nearly died. Bingo! I then amazed myself by being very cool, calm and collected outwardly-inside I was out of this world. The dance was slow and smoochy. I was aloof and John, I think, was slightly embarrassed. It was all very painful and beautiful at the same time. The remaining students were looking on with puzzled expressions at such an unlikely combination.

John was in constant need of proof of love and security and he was constantly testing people for that proof.