Dear Jen
I am sorry you are having to go through this. This man appears to have Narcissistic Personality Disorder: initial love bombing of you to win your affection; never wrong in any matter ever; stonewalling you when you try to express your feelings; and ‘gaslighting’ you, (so you begin to question your sanity) by accusing you of sending threatening messages.
I have lived through all of this with a close relative and only worked it all out having come across an article on NPD. There is lots of information on this subject on the internet and I would urge you to read it.
My advice – save your sanity and run for the hills!