What happened was that Asher arrived unexpectedly at McCartney's home in Cavendish Avenue, London, where she reportedly found him in bed with Francie Schwartz. She walked out and sent her mother to collect her belongings, signalling an end to the relationship. (beatlesbible.com)
“I always feel very wary including Jane in The Beatles' history. She's never gone into print about our relationship, whilst everyone on earth has sold their story. So I'd feel weird being the one to kiss and tell.
We had a good relationship. Even with touring there were enough occasions to keep a reasonable relationship going. To tell the truth, the women at that time got sidelined. Now it would be seen as very chauvinist of us. Then it was like: 'We are four miners who go down the pit. You don't need women down the pit, do you?
We won't have women down the pit.' A lot of what we, The Beatles, did was very much in an enclosed scene. Other people found it difficult - even John's wife, Cynthia, found it very difficult - to penetrate the screen that we had around us. As a kind of safety barrier we had a lot of 'in' jokes, little signs, references to music; we had a common bond in that and it was very difficult for any 'outsider' to penetrate. That possibly wasn't good for relationships back then.” Paul McCartney
Anthology
"I think inevitably when I moved to Cavendish Avenue, I realised that she and I weren't really going to be the thing we'd always thought we might be. Once or twice we talked about getting married, and plans were afoot but I don't know, something really made me nervous about the whole thing. It just never settled with me, and as that's very important for me, things must feel comfortable for me,
I think it's a pretty good gauge if you're lucky enough. You're not always lucky enough, but if they can feel comfortable then there's something very special about that feeling. I hadn't quite managed to be able to get it with Jane." (Paul McCartney - Beatlesbible.com)
McCartney and Asher had been together for five years, since meeting at the Royal Albert Hall in 1963. However, McCartney had a string of other girls, mainly while The Beatles were touring - and in 1968 began an affair with an American woman, Francie Schwartz.
I met Jane Asher when she was sent by the Radio Times to cover a concert we were in at the Royal Albert Hall - we had a photo taken with her for the magazine and we all fancied her. We'd thought she was blonde, because we had only ever seen her on black-and-white telly doing Juke Box Jury, but she turned out to be a redhead. So it was: 'Wow, you're a redhead!' I tried pulling her, succeeded, and we were boyfriend and girlfriend for quite a long time. Paul McCartney Anthology
Just an year before Paul flew to Denver from San Francisco to pay a surprise visit to his girlfriend Jane Asher on her 21st birthday. Asher was touring with the Old Vic theatre company in a production of William Shakespeare's Romeo And Juliet. McCartney had flown to America on 3 April 1967 with Mal Evans.
In the evening McCartney and Asher were reunited, and Rosenthal drove them to a hotel where a birthday party was held for her. The party had been organised by the Old Vic.Asher had initially liked the look of George Harrison, and all The Beatles gathered round her after McCartney began chatting to her.
They invited her back to their hotel, the Royal Court in Sloane Square, before moving on to the Kings Road apartment of Chris Hutchins, a journalist.'They couldn't believe I was a virgin,' says Jane. (The Beatles Hunter Davies)
July 17, '68: Jane Asher misses the Yellow Submarine premiere and reports her breakup with Paul to the BBC. The world première of The Beatles' animated feature film, Yellow Submarine, took place on this evening (of 1968) at the London Pavilion on Piccadilly Circus.
The only Beatle to arrive alone was Paul McCartney, whose fiancée Jane Asher was absent. Three days later she announced the end of their relationship on BBC television. News spread when Asher had failed to attend the world première of Yellow Submarine three days earlier; all the other Beatles' partners were there.