Cleese is not the gregarious kind of person.
Regarding the Phytons: The Terries, Michael and Eric were always gregarious and friendly to fellow artists. NotJohn Cleese, who have always run away from sentimentality and emotions. Chapman was a book apart: had drinking problems and emotional ones also, because he was homossexual and acceptance of his life style was low in the 60's and 70's.
The Love You Take is Equal to the Love You Make