I agree with calling to talk first...before cancelling.

Is your fragility regarding your relationship with your T (for not calling back) or with your husband or with the work you are doing there?

If it has to do with the work you are doing there then it may be beneficial to show it there... well I do that in individual. How would you feel about showing that in front of your husband?

It is difficult for your T perhaps to shift roles as he wishes to support you but now he is doing work with both of you. My thought but I do not know.

Might you even talk to him before the three of you sit down in the room.... like without hubby in the room? Could that assist at all or would that be too much at one time?

Good luck