i have come to this post late as well, but have to say that, i as well as maybe alot of ladies have experienced domestic violence, and even wrote a factsheet about it when i worked in the public sector.  So i researched it when i wrote that factsheet.  And i know alot about it anyway from the psychology of men.  The thing that strikes me about your situation, is that repeating what others have said, he has a need to keep punishing you, and he will keep doing that.  Your view about your mom's change of heart in turning on your ex, (that it will make him furious)  is probably right...., abusers make a point of ensuring that your loved ones are against you and your friends are cut off from you, and all your favourite possessions smashed.  I have to say i am worried.  Yes, do not engage in communication with him, but he sounds like someone who would escalate his vileness against you.  Please keep a record of all his communications, and apart from all your stressing about who knows what and how they are reacting, listen to your gut feelings.  I recommend going to police too, even tho with some guys this has no effect whatsoever, they just want to wreak revenge no matter consequences to themselves.  Please do everything you can to change all your details and move from where you live etc.  Keep yourself safe and do everything you can do change all the things you know he knows about you, and more besides to be on safe side.

I am so sorry for your situation and we all are happy to give you a group hug anytime you need it.