Sorry to burst all the positive feedback you've been getting but telling my T ruined our relationship. Not immediately but had the impact that you fear. Pulling away from me, not as warm and inviting as it was, awkward, etc. I had to push to get our relationship back on track. It worked for awhile but now sadly it's over. He was a great T too and probably knew my feelings before saying them but once it was vocalized, it changed things. If you can wait, I would wait and let the good feelings sit on the sidelines for a bit longer. I'd even suggest waiting until Dec. to tell her. You'll still have your last semester to work out the feelings if it goes well and if it doesn't you won't have to wait so long to say goodbye. Good luck whatever you do. I hope things work out better for you.