I also wonder if you are serious. An adult woman with an adult son, on a mental health support site, presents a textbook case of paranoid delusions and does not identify it?!?! You identified the possible OCD but failed to see paranoid delusions? Between the two, which one is worse?

Also, forgetting dx's and returning to lay parlance - the man, per the first two lines of your post, is a weirdo. That part is clear and NOT confusing. Your behaviors - what you let him do, such as deleting messages in your dating profile - are what is confusing.