Now you have got me curious too!
Sorry I forgot to reply to this earlier.
No big mystery, when I was young I was friends with the son of a French diplomat who was based in Perth.
He lived around the corner and was in my class at school.
We made a deal that I would help him learn English if he taught me French.
Later I studied French at high school and university.
Then I travelled as a young adult and spent time in France, Belgium, Switzerland and Tunisia.
After a long period of no international travel due to the cost of raising children, more recently I have spent more time in France as well as Morocco and especially New Caledonia. Wherever I go I make a point of staying with local people and avoiding tourists. I have even pretended that I don't speak English.
I started that to avoid socialising with other anglophones - Aussies and Brits and Yanks. Not because I disliked them but because I wasn't in France to speak English.
Over the years I have made friends in Paris, Lyon, Marseille and Nouméa and it is probably those friendships which have improved my language skills the most.
Although I have completed an advanced French course online through a Paris unviersity and also paid for some private tutoring here before each trip to make sure I am not rusty when I arrive! I would not want my French speaking friends to feel like I was using them as unpaid teachers!