Please try to get a different perspective on this, honey.
If he was intent on revenge or had embarked on some vendetta against you, your phone would be ringing off the hook. your email inbox would be deluged, you'd be getting pizzas/cabs/hearses/wedding cars turning up at all hours, and you'd spot him hanging around on virtually a daily basis.
The fact is he hasn't screamed down the phone at you for years, he may have blamed you when his marriage failed but you have no idea if he still blames you for that or any other ills that have befallen him, and if he was responsible for the 'attacks' on your door he's not come further than the road outside your home since you installed cctv.
He lives in another country, he fetches up twice a year if that and, far from 'taking more steps' to get closer, if anything he's retreating.
If he had wanted to get into your home he would have done so by now, and let's look at your worst fear realised which is that you'd wake up to find in him your house.
What would you do? I somehow doubt that you'd sit quietly while he murders you and, as I've said before, my money would be on you to kick his arse out the front door in double quick time with or without the help of the police.
In some of your earlier posts you've endeavoured to label him as a 'path' of some sort. An apath, bpath, monster raving loonypath, when the truth is that he's a common or garden twat of the deeply ineffectual variety.
If you are playing 'a game of human chess constantly', you're playing it with yourself and you haven't had 'beginner's luck' at stopping him doing anything 'really bad' because he doesn't done anything really bad.
As for 'surviving' him, you'll outlive him by many years and he doesn't have the ability to crush you - only you can do that to yourself.
He was 'parked' outside your house 2 days ago? If you see him parked outside your home again, call the police, get a camera, and take photos of him.
You've said you live in a cul de sac which leads to nowhere and it should be patently obvious to the police that he doesn't need to drive past, or park up anywhere near, your house.
If your cctv doesn't have much going for it in the way of clarity, they're not expensive - buy another and hook it up to a tv in a upstairs front room with the camera partially concealed by a curtain.
All in all, honey, he's about as much nuisance as a fly, but you can swat him more easily than one of those dratted insects.
FTR, and to clarify one of my earlier responses, I am certainly not advocating that you don't call the police if you suspect he's up to no good outside your home but, in the light of recent developments with SS in respect of other allegations you've made against him, if you should need to call the police because of any untoward activity outside your home, I am advocating that you do not mention his name unless you have irrefutable evidence that he's responsible or in some way involved.
You need to protect your back in more ways than one, honey, and you can best do this by refraining from making any further allegations against him unless you are in a position to provide proof positive of what you are claiming.
Vent on here by all means, but please don't use it as an exercise in fuelling your already vivid imagination. He's not the boogeyman, honey. He's a drink/drug addled twat who would most probably jump out of his skin if you marched up to him and said 'boo'.
I know you can do this, sea. You've fought like a tigress for your ds and all you need to do now is to apply the same drive and determination to building a less isolated life for yourself.
Maybe you can do this by spending more time on this site dispensing more of what I know to be your excellent advice to others who are battling to get the best for their dc as you once did. And, hopefully, you'll build up a group of virtual reality friends who can help to keep you grounded when your fears get the better of you.
Laugh more often, honey, because life is good and he is laughable 