<human>: I have a fiance who I've been dating for two years and she has a quite psychotic ex that seemingly will not stop trying to contact her.  Just when we think he's given up and is leaving her/us alone, he tries calling her at work or sends a creepy e-mail with knowledge of something that she's involved with to show that he has the ability to pry details about her life.

Because he's not physically harassing her, we cannot file for a restraining order.  She has already changed her number once and gotten a different e-mail address but he keeps getting this information, most likely through networking with friends of a friend of a friend (she has severed all ties that she can think of).  The cynical and vengeful side of me wants to completely ruin him and make him ever regret messing with us... but I imagine taking the high road (well, as high as such a situation like this calls for) is a better option.

Can you condense the text into three sentences or less?
<bot>: Reddit, what would you do to get an emotionally unstable ex boyfriend to back off and move on with his life and leave us alone?