High Priest, my arse. High and pissed more like. When he's not imbibing Guinness, he's a doing a few lines of coke and making out he's the next Aleister Crowley who, for the record, was not a particularly proficient warlock thanks to his fondness for plant by products.
I won't reveal the name of the website you found him on, but let's just say any coven he belongs to rarely leaves the the pub and the only spirits he's capable of conjuring up are those that are to be found behind the bar.
He live in a not too distant country which is a ferry ride from the UK. Once or twice a year he visits his dps and you happen to live along the same motorway he uses when he goes to see them.
It's no sweat for him to turn off said motorway, drive past your house, and effectively go 'yah boo sucks to you' before he continues his journey to and from the ferry.
The man is pathetic. He's ineffectual in every way. He hasn't got the balls he was born with.
Jeez, when I think of the fighting you've done for your ds I'd put money on you seeing off 10 of him if he were to dare to try and gain entry to your home without your consent.
I made a suggestion to you a year ago; you live within commutable distance of a centre of excellence for autism and it occurred to me that you should consider renting your spare room to a student or someone who is taking up a short-term placement at that establishment at a reduced rate in return for a few hours babysitting a week.
This would give you the security of knowing that another adult is in the house at night and would also give you the opportunity to go out for a couple of hours one or more evenings a week after ds has gone to bed.
Please consider this possibility, honey. Along with extra income, it could provide the stimulus you need to take your mind off the twat and focus on other matters.
FWIW, in the past 2 years or so, my pristine wheelie bin was nicked, my recycling box that had happily lived in a spot under the hedge for umpteen years went the same way, one of my car windows was smashed and the tax disc liberated, I found a dead rat on my doorstep - no visible cause of death but I wasn't about to perform a postmortem on the deceased - and a couple of bricks I'd placed under a large tub to aid drainage mysteriously disappeared causing the large plant it contained to almost commit hara-kiri due to being severed from its dedicated trellis fixed to the wall of the house.
Add on assorted oddbods giving every appearance of casing my house while unashamedly grinning at my cctv camera and I could be paranoid about one or more of my exes 
but the fact is it's part of urban living these days.
And don't get me started on the weird and wonderful happenings that occur inside my haunted house 