It is not ethical for Ts to comment on physical appearance or attractiveness. It is suggestive, verging on provocative - or even the start of grooming. This is the standard of practice and Ts can get in trouble for that. Precisely because of the confusion such comments create and possible ensuing abuse.

I would listen to your inner voice i.e. being uncomfortable or feeling for a while now that something is 'off' between the two of you. That voice is the best guidance you have. Definite red flag / alarm here.