There is nothing you can do to force someone to act in a way opposite of their nature. Nothing. If that's what you want, then you have to walk away. For both of you.

Can you imagine how it must feel for him to watch you in such pain, pain he has caused you? That is why avoidants avoid - they don't want to disappoint people.

The only way you can be with him is if you accept him as he is. No changes at all. If he can't be touched, he can't be touched, and that is all there is to it.

Ironically, if you can do that, there is a chance he will be able to open up more. But there is no guarantee of that. You can't expect it. It would just be a nice bonus if it happens.

I would advise you to end it. You tried. You failed. Find someone else now. Unless there has been a major change, you'll just keep repeating the same pattern. The only change that can be made is for you to accept you can't have a "normal" relationship with him, for you to lower your standards to match his. Why on earth would you want to do that? And even if you do, he will know that you want more, and it will hurt him every single day. Is that what you want? To hurt him every day of his life?

Find someone new. It's time.