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The thing is their friendship was complicated in many fronts, but yeah, it was real and toxic, and definitely romanticized. They both had lose, abandonment and other issues since childhood and developed different ways to deal and face their lives, they still had a real love for each other(platonic) but the way both viewed and handled each other was toxic and naive before their beef, then remember that the music industry is a hellish business that helped to deteriorate their mentalities and consequently their relationship, it was just matter of time until it bombed and went downhill, but the good bits and the love was still there, and so it was romanticized by people, the media and themselves cause those bits are enough to feed the image of mystified relationship and cover their disconnections.

When they had the break up they founded a new world and had realizations about their realities, the 70s was the decade they started to process what happened with them with some free mind, although the early 70s was a mess, in the end they came in terms with their views, feelings and (maybe) their relationship.

John's hard relationship with "Yesterday" (MASTERPOST)

1965: On August 1, 1965 Paul performs "Yesterday" on the TV special Blackpool Night Out. During rehearsals before the show, the Beatles entourage watches Paul run through "Yesterday" along with the stage crew. Afterwards John makes a "loud and decidedly sarcastic remark" deriding the song in front of everyone present. Beatles publicist Tony Barrow says the remark "upset Paul for several hours".

2. 1971: John came over to my loft one day and he was all excited,” [DJ Howard Smith] recalls. “He said, ‘I think I finally wrote a song with as good a melody as Yesterday.’” Sat at Smith’s piano, Lennon revealed he had a title – Imagine – but only a smattering of lyrics. For the rest he sang ‘scrambled eggs’. “He played it through and asked me what I thought. ‘It’s beautiful.’ ‘But is it as good as Yesterday?’ ‘They’re impossible to compare.’ So he played it again. And again. And he said, ‘You’ll see, it’s just as good as Yesterday.’ - Howard Smith, interview w/ Danny Eccleston for MOJO: John Lennon was haunted by yesterday, says confidante. (July 8th, 2013)

3. 1970: An excerpt from "God" from "John Lennon/Plastic Ono Band" album: The dream is over, what can I say? The dream is over, Yesterday...

4. 1971: An excerpt from "How do you sleep?" from "Imagine" album: The only thing you've done was Yesterday, and since you've gone is just Another Day...

5. 1971: John and Yoko celebrate John’s 31st birthday in their hotel room in Syracuse, New York, surrounded by friends and guests. John sings: Why he had to go, I don’t know, he wouldn’t say… 

6. “Yesterday drove him crazy,” veteran New York journo/broadcaster Howard Smith told MOJO. “People would say, ‘Thank you for writing Yesterday, I got married to it, what a beautiful song…’ He was always civil. But it drove him nuts.” [x] MY CONCLUSION: John's relationship with Yesterday, like his relationship with Paul, was complicated. He clearly appreciated the song as one of McCartney's best, but on the other hand he was very jealous and fierce, and even a few years later set "Yesterday" as a role model. Most interesting is the mention of "Yesterday" in "How do you sleep?". Lennon simultaneously challenges everything Paul has done, but is unable to deny that this one song is a masterpiece. Certainly an important factor was that "Yesterday" is the first Beatles song to feature only Paul. Newspapers declared: "Paul McCartney #1 without the other Beatles". This must have appealed to John's abandonment issues. Not only was he afraid he was a worse songwriter than Paul, but he was also terrified that he would be abandoned by McCartney and the other Beatles.