Any relationship can be unhealthy. What any therapist worthy of their degree needs to look at and understand would be the benefits for you vs the negative aspects. The specific details of the relationship are key to understanding. If you feel your therapist is one well suited to you, it really would be in your best interest to explain your rational. If she is not receptive in any way then I would suggest it's time to go on the hunt again.

I've been seeing therapists on and off for 10 years and have yet to find a match for me. I'm still hopeful though.