I need some objective viewpoints, as I'm not sure if I'm getting paranoid or if something weird is going on here. 
I got to know my next door neighbour last year when I was single. He was very interested in dating and so was I initially, but he came on very strong and got extremely controlling very quickly. After we got chatting and swapped numbers, he tried to insist on me seeing him straight away. The last time it happened he asked to see me, I said I was out with friends and he asked to see me when I got back. I said politely that I wouldn't be back until very late and had to go to work at 5am so I wanted to go straight to bed. First he said I should come and sleep with him, then apologised when I said that was way too far, then he tried to insist I just pop in and see him for five minutes so he could apologise. I said no, so he said he'd bought me a "treat" and I just needed to come by and pick it up and then he'd "let me" go home. I told him that wasn't happening. So he watched for me getting home, then came over and knocked, so I ignored him, then he texted to say he'd left my "treats" (that word makes me shudder) on the doorstep! Turned out to be chocolates which I threw in the bin. I told him I wasn't interested after that. He texted me for months begging for another chance, then fell quiet. (I didn't block him as I'd rather he was able to text me than come and knock on my door, but I was politely clear that I wasn't interested.) He completely blanks me now but his expression is always furious when he does.
Now the car stuff: I live in a small group of houses with a secure gate and shared car park. A young single neighbour, around my age, was recently driven out by someone repeatedly putting nails under her wheels and at other times letting her tyres down). She lodged a report with the police but there was no evidence of who did it, and she eventually gave up and moved out. So that was horrible for her (and weird for us all, as we knew it was someone in the estate).
Then weird stuff started happening to me too, after I got a new boyfriend. First, my boyfriend parked his car in one of the two "spare" spaces for two days the first time he stayed over (it's in everyone's contracts that these spaces are first come first served for visitors, and they are almost never used). We were walking to the houses from his car and creepy neighbour bumped into us, looked furious but then ignored us. After that during the day, someone printed a (fake, as it turns out) warning notice, supposedly from the estate management service, saying this was an allocated space and threatening to have boyfriend's car towed unless he moved it. A quick google showed it was printed from a general online generator, but just in case it was actually the management I called them and turns out they hadn't left the notice. We moved the car out onto the next street for future visits anyway, as we thought if someone cared enough to leave threatening notes then they might well be capable of keying the car or something. Thought that was the end of it. But we just found today that someone had let down his tyre (no puncture but totally flat; fine once re-inflated). Again, weird.
Finally, I had a car accident last month. I noticed my steering was a bit "weird" (felt loose?) when I was out driving, but didn't quite register it before turning a corner, losing control and smacking into a tree. I was going an appropriate speed, had just had the car serviced a month earlier (everything was fine) and have never had an accident. Unfortunately I sustained a head injury and the car was written off and scrapped before I recovered enough to think about this sort of thing, so I'll never know if someone tampered with it.
I know these things happen, but with the other things that have gone on and now boyfriend's tyre being let down today, I wonder if the person who victimised my poor neighbour might also be targeting me (and no prizes for guessing who, if so). I'm entirely open to being told I'm paranoid. 
Thoughts?