I disagree with Alecc, I don't think it's a necessarily an unhealthy relationship. I feel this way with my T all the time. I finally brought it up to her, and she was so understanding and reassuring that she wasn't going anywhere and how it's important to be honest with her.

I think facing it head on and talking with your T about this would be best. It was hard and scary, as I have major fears of rejection, etc, but in the long haul it truly helped.