What level of contact are you happy with...?
Aibu or have reason to worry?
They meet a couple of hours a week for the lessons (on a one to one basis) There is nothing particularly incriminating.
He looks like enjoying her classes a lot but there's every chance it's perfectly innocent. I have had this type of relationship with a few male colleagues in the past.
I met her once only by chance and she is very pretty! He has her email address but also her WhatsApp.
We've been together for more than 10 years, 1 kid. Things are ok between us as far as I'm aware.
Perhaps I'm just jealous of her and their meetings about his new challenge/hobby of learning French. We have a cottage in France and visit there frequently.