I saw my T every other week for a year between 2011-2012 and then had a long break before I decided to start up with her again in early 2016. I wasn't nearly as attached to her then as I am now so it's hard to say for sure on the connection piece, but for me I knew I was ready to stop when things were going well in my life and I didn't have a somewhat urgent need to talk to her about something every time I saw her. I was still getting what I needed from her and I still liked her, but it felt right to stop and she agreed with me.

I don't think you have to not feel any warmth or connection in order to stop. In fact, I would be curious about why you feel that way now when you didn't before. Has something come up between you? Are you feeling uncomfortable about your connection and thus on some level trying to make it go away? Do you feel like a happier, more secure version of yourself now and she just takes up less space? These might be good things to think about, especially if you have attachment injuries in your past.

You seem a little ambivalent about the relationship with your therapist, especially when you say you're worried about getting trapped into staying. That might be a sign that the relationship isn't working for you anymore, or it might be a sign that you still have plenty of things to talk about.

For what it's worth, I don't think there is anything wrong with being attached to your therapist. It can be a way to rebuild your core self in a safe environment, and there is no shame in bringing your genuine feelings into therapy with you.