Hi 
Peace4ME ... .  great job in reclaiming your home  

Without knowing your history I would give some general advice that applied to my situation... .  
1/ Do not become involved in discussions about why this is happening... .  it's past that now... .  it will escalate the drama.
2/ Request his keys back... .  even when you get them (or if you don't) change the locks! this is ESSENTIAL!
3/ Make sure EVERY possesion of his is removed from the property... .  things are often "left" as an excuse for more contact at a later date.
4/ If you are close to your neighbours, inform them (when he has) that your ex has left the property for good, and has no right or need to be there... .  and you'd like them to inform you if they witness him "loitering around".
5/  Smear campaigns can be minimized by having a friend or family member who is aware of the situation to be present at ALL times your ex is clearing his things... .  and for a few days afterwards if needs be. Keep in regular contact with people you trust, that are local... .  and report any "odd" goings on to them, no matter how small they seem.
6/ Stay focused on WHY this has to happen right now... .  rather than the sadness of it happening.
I am not meaning to alarm you, I think you have every right to be sceptical about his behaviour, this is practical advice... .  and you did ask!  

A question... .  why would he have to "start" to move out this weekend... .  moving does not take long if you have the vehicle and the motivation to do so... .  it sounds like it will be prolonged?... .  Could you clarify?... .