I know how it feels. I could have written this. All of this. Only with me it was (supposed to be) temporarily termination because of her pregnancy. It's over 5 months ago since I last saw her. She's now back at work but I haven''t heard from her. I do have a current T.

But how to deal with this? How to get over this? I don't know.
I'll have a session with current T and PrevT, to help me with my attachment, to find out why it's so bad and what we can do about this.
Maybe you weren't ready for termination yet or didn't had closure. I had that too. I wasn't ready for a life/therapy without T. We hadn't really dealed with my attachment. And now I've been hurting since the last time I saw her. Lots of googling and looking at her Facebook. I feel jealous and angry of the clients she'll start seeing now.
I want her back as a T. But I don't know if that's possible. And I don't know if she still wants me. I've a feeling she dislike me now.

I can work with current T and (hopefully) PrevT. But you can't. Maybe you can work on this with a new T?
Or try it yourself. Why is this attachment so big? Have you had this ever before? What do you want from her? Probably there's a need. And she can't fulfill that.
This is a bit from what T has asked me. It's difficult. I don't know why I have this with her. I haven't had anything like this before.