I agree with you that's confusing. I won't go either to that introductory meeting, he is trying to influence you in a very twisted way to attend it.
You didn't respond harshly to him, you just stated your own opinion which you are entitled to. You can suggest him to to go to MC instead where you feel it might be more productive. Don't let him to drag you back in his emotional mess, you were finally able to get out of it.
In my opinion (that's only an opinion), he noticed that's you are really detached and ready to move on without him and he has lost his "power" on you. When the LBS is not the pursuer anymore, usually the WH feels that he lost something, somehow you might be his security blanket, without you who can he blame for his unhappiness anymore and to whom he can go back if he discovers later on that the grass was not greener on the other side of the fence.
I am very proud of you, your emotional transformation in regard of that situation has been amazing since December.
Big hugs to a very special strong woman.
Me 52+ WH 57+ Married 20 + Piecing since 2016 (ready to give up...)