Ofelie, that is all really, really weird, I agree! Do you have concerns for your safety? ANY kind of concerns? I'm not that knowledgeable about that sort of topic, but as you know, many here are quite experienced (unfortunately) w/this kind of stuff.
To me, it seems as if it might be good to try to be extra safe--maybe stay with someone else for a while, someplace he wouldn't look for you?
Sorry this crap is happening and he's back on your radar screen again!