Just because someone apologises and you forgive them doesn't mean your feelings will automatically go away and everything will become okay again. Sometimes people can have good intentions but do the wrong thing and it can still hurt like hell! It is okay to be angry at your therapist for his mistake, it is okay to be annoyed at his boundries etc, these are just feelings they're not wrong or right or anything in between. I wouldn't make yourself feel anything you don't, that is more painful than what your therapist did.