Name change as lots of details.
So I have an ex, it was a very immature relationship that happend when I was in my late teens and he was early 20's. We'd only been together a handful of months when he suggested we get engaged and made noises about trying for a baby. I was understandably freaked out and dumped him.
But ex had a friend, we'll call her Jess. Jess was very controlling with ex. She'd insist he came on drives with her when we were having date nights. She'd turn up at his house and demand he came outside for a smoke, while I was sleeping over. And she was obsessed with telling him I was jealous of their relationship, honestly I didn't give two hoots. When we broke up ex implied they had been sleeping together the whole time, which wasn't surprising.
But anyway, we broke up, moved on. A few years have passed, but...
Jess is currently moving in next door to me as we speak 
I don't think she knows I live here, I'm slightly panicking and having visions of her snearing at me anytime I take the bins out in my PJs. Or judging me through the window as I'm unattractively gardening. If she's still friends with ex, no doubt he'll be there all the time too, maybe they're a couple and he'll be moving in too.
Please tell me I'm being ridiculous and she won't recognise or care about me!