Its a slippery slope...once you let a guy walk all over you...he will take you as a door mat...happens in work place, with girl friends, friends and neighbors. Filipinos are very non-confrontational and are tolerant and they let go of things we wouldn't give second chance.
If a Filipino complaints...know that something is very serious....we can do any stuff we want...did they ever complain? I have done stuff in the PH...if i do that back home...i will get a black face from everyone around me.
No amount of lawyer will solve this problem..i can bet my last dollar..some people are wired that way to be insensitive, exactly the way we are sensitive to other people needs. No amount of logic and explanation will work...you are on the right side and feel injustice, happens all the time.
Your only way is to as some members suggested to give a physical response to what he is doing at first in reverse...however, if he continues his way...which more likely he will...i dont know you have to take some extreme steps to put some sense in his mind.
There are 100's of movies made on this exact situation

and it always ends in violent explosion..when a guy can't take it anymore..i hope it does not end like that....so better start giving him small doses of his own medicine...
DO NOT stop what you are doing...try to irritate him more..make him think at all cost that...you will not take this anymore and you are more evil, dangerous, mad, retard and from an asylum and more than capable of ding physical harm to him.

..i know sounds crazy but its the only way to stop a crazy guy by letting him know that you are more crazier and hellish than him...
Good Luck