I have the same with PrevT. I never asked her ''do you like me'' or questions like that. I'm too afraid for the answer or that she will say that she can't answer that question. Instead I just express my concerns like ''I'm afraid you have enough of me''. But that doesn't give me answer because she then doesn't say something like ''I don't have enough of you''. And she also talks a bit around the subject if it's about me and her.
(She isn't a psychodynamic T.)

I also want a hug from her. Not every time or so. I just want to feel how it feels. I never had the courage to ask her, but I have said that I would like her to give me her hug. But on that she didn't reacted. I don't want her to make everything better, because I know she can't. But she could make things between us better, or at least help to make it better. By being honest and more open about her, about our ''relation''.

I don't have a healthy attachment to her. Once it was healthy, but now it's damaging for me. It's a bit obsessive. I think about her more than anything else in my life. If I think about her and it are hurting thoughts (she doesn't like me, she doesn't want me) then I get depressive and I don't care about anything. Nothing is important.
She isn't my current T anymore, because 6 months ago she went on leave and I had to transfer to another T. Now PrevT is back. I'm now in grouptherapy which is being lead by current T. I'll have at least 5 sessions with PrevT to work out this attachment and my anger and other feelings towards her.
Current T says that it's important to figure this out because it can also happen in other relationships. But I doubt that because it has never happened before.

I also have no idea how I get out of this unhealthy attachment, this obsession. I can tell you how me and current T have make a begin on this. She's a schema therapist.
You have the 'healthy adult'. > she used to be a good T, I don't think she hates me (I hope).
'Vulnerable child' > she feel angry, but also sad, abandoned. What she readlly need is to be seen.
'Demanding parent' > she has enough of me, she isn't interested in me.
Protectors (what you do to not feel/think) > I use avoidance, but I have also an angry protector, how could she just go 6 months without emailing me once to check in how I'm doing, and somethimg a bully/attacker, like sending an angry email.

This is a little bit of my schema. From there we going to work furthur. I don't know how. I don't know I get out of this attachment.

Maybe this can help you too? Maybe it can help you to get a little bit more insight in why you're so attached?
I also don't think you can work this out without your T. PrevT has been gone for 6 months and I've talked to current T about all my issues about her, but in those 6 months it hasn't changed.