I felt the same way when I ran into my T at the grocery store too. However, I wasn't able to avoid mine. Met up face to face by the shopping carts. She saw me first, had a big smile and said hello. I must've looked like a deer in headlights. I managed to reply with a simple "hi" and kept walking.
my new t tlod me on day one that if she saw me in public, she wouldn't acknowledge me. For confidentiality reasons. I think it takes the pressure off if there is an encounter.