Yes, exactly. Paul and Linda came to visit John when he was living with May Pang in LA, according to her documentary, and there was other sporadic contact after the breakup, but not hostile.

If memory serves the whole breakup thing was because they had been working almost non-stop for ages, and then the catalyst was that Allen Klein (who was a truly sketch individual even by the most generous accounts) got involved with their management, and that just pushed it all too far.

But they never hated each other, McCartney and Lennon had been friends literally since childhood. They were just hurt and angry, and surrounded by users who stood to make coin by capitalizing on their own specific individual relationships with band members, like Klein.