erotomania then paranoid delusions? is this dysphoric mania?

I was going through a rough time in college and became infatuated with my middle aged professor. I never told him how I felt but we became fairly close and I was really good student.

One day, I noticed him using, in class, the same phrases I had said to him in office hours, but in a different context. It felt like he was trying to hit on me. This, plus a couple of other things, led me to believe he was trying to communicate his love for/sexual obsession with me, but in a coded way. I thought he had misinterpreted my crush on him as an actual advance, or else was "grooming" me. Even though I liked him a lot, I was devastated. I thought I'd been duped and everything he said to me before was insincere.

From then on, everything he said had a hidden meaning. It felt like he was speaking only to me during lectures.

For a while, I thought he was hypnotizing me with NLP hypnosis in his emails and in person. His pocket squares, their colors and the side he wore them on, represented his association with BDSM. And when he used a lot of "s" words on a paper comment I thought he was imitating the sound of hissing serpent (we were reading Paradise Lost in class), a clever reference to his "Satanic" seduction.

Eventually, after reviewing all our conversations for hidden meaning I came to believe that he was in fact a cross-dresser (long story) and had seen me in the city one night and mistakenly assumed I was a prostitute. This whole time he had been trying to solicit my services/seduce me in a covert, "coded" way.

And because I ignored him he had become enraged and humiliated. Whenever he spoke about violence or rape in class (it was part of the subject matter he was teaching), or even used the word "hunt," I believed he was threatening to rape and/or kill me. I believe he named his son after a famous fictional serial killer and possibly had other victims.

In his last email to me he made a typo and forgot the word "you." This freaked me out and seemed to signify a threat to eliminate me.

You're probably reading into it too much. I had a professor that wanted me to remind her of something when we met in her office. She told me to "stay on top of her" three times. Probably best to ignore it. Everyone flirts, whether it is fun or serious or even without intending to.

The threat to eliminate you is more alarming but if you recognize it as not real, that's good. Your story sounds too farfetched and you were probably over-analyzing it. What we perceive rarely is true reality. It's something you'd want to talk with a psychiatrist about in more detail.