Hello Elsa. I have the same issue with detaching that you do. I'm still learning... so best advice I can give is to promise yourself not to take it personally. Be calm and upbeat... listen to his point of view.... let him know what doesn't and does work for you.
If you have time, you could even email H your options above, let him know your best preference, and then ask him to tell you what he thinks when you meet. That way, when you talk... the conversation could be shorter and under your control as he has to explain himself against your preferences. Beat him to the punch and let him catch up to you.
If it doesn't go your way... have tentative plans beforehand so you can say... "no problems... I have plans myself." Then go and enjoy yourself.
Maybe that would work? Good luck.
Me: 44 W: 45 S: 11 Married: 15 Together: 18 BD: 9/29/2014 OM discovered: 10/16/2014 I left her behind: 12/14/2014