I am so sorry this happened to you. I don’t know if this helps but he must care about you very very much to freak out on boundary issues. Maybe he scared himself at how casual he has been with you. My first instinct is that he has feelings for you but is not managing them well Maybe he doesn’t trust himself to stay professional. He is not handling this well and I hope he seeks supervision

It would hurt me too to hear those words. Who knows I might be heading towards a boundary crackdown myself. If there is anything pc people can do just reach out.