You've handled everything beautifully. Here's the next step.
You've told him about Retrouvaille. Tell him he has to sign you two up for it. That will show you if he is serious or not. Leave the ball in his court and try not to have expectations.
He can talk all he wants and you said he's done this before. Actions speak louder than words. If he doesn't sign up or gives you a list of reasons why he couldn't, then you know his "change of heart" wasn't sincere.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.