Although John was married and Spector was dating her producer, Phil Spector (her future husband), the pair flirted at that party in London. However, Spector put a stop to it before it went too far.
Rock Legend Ronnie Spector Recalls Her Close Friendship (and Almost Romance!) with John Lennon
If John was ‘sending messages’ to Ronnie Spector, that may partially explain Phil later chasing John around with a pistol. Some real rootin’ tootin’ intimidation tactics.
John later wrote a not so well known song (at least not to me) called Jealous Guy. In that, he is on the receiving end of getting burned by suspicion and doubt.
That song is marvelous, dark and melodic in a lilting kind of way. It’s sort of a meditation in first person.
The piano and the violins paint the scene. The piano was played by a Nicky Hopkins, in a gospel style. I knew it was too good to have been John playing.