How do you get your shit back?

How do you give him his stuff back and get yours back? I wanted to and my therapist reconfirmed that i should just send it to him through the post. When I told him I was going to do that he asked that I please don’t and he won’t post my stuff. He asked we see each other one more time. And then this week I got sick so I couldn’t do until next week. But I just want to be down with this I don’t want his stuff here and I don’t want to see him again. Now he’s prolonging it by saying he wants to talk about it later when I bring it up. He’s okay if I get a friend to meet up with him but I’d rather not get someone else involved. Am I being too considerate with his wants when he never really was considerate towards me?