I think my dad's girlfriend is possibly a psychopath.
Why would you think she's a psychopath?
I don't know, I just feel that way.
Without good scientific evidence, it is not correct to label your dad's girlfriend as being psychopathic. Keep your armchair diagnoses to yourself.
Whatever. I just hate her anyway
I just don't think you should call her such names on a whim, even if you do hate her.