Wow, firstly, congratulations for making so much progress! I struggle with eating issues too, and know how deeply ingrained they can be. It's really fantastic that you have been able to make such significant changes. Your T must be a good one

In my view, a good therapist will make sure that she is working to her client's goals, and won't delay the ending of therapy just because you're both comfortable. Your T may see that you are near reaching the goals that you agreed together, and you haven't (yet) set any new goals together. I don't know what kind of therapy your T does- some (like CBT) tend to be time limited, and some therapists won't see clients indefinitely. But this is definitely a conversation you should have with your T, and maybe you could negotiate together some other goals you'd like to work on. It sounds like it would be a shame to lose such a skilled therapist when you still have goals to work on.