Wasn’t sure where to post thing - legal, relationships, step parenting, etc- because the whole thing is bloody bonkers.
Basically I’m (We’re) having an Issue with my partners ex wife.
It was only a month in to the relationship when I found out she is not a nice person. Not just towards me but towards the whole population in general.
My partner has a child with her and I have one of my own. We have been together for the past two years now - he was split for some time and I was not the other woman. She has had two relationships since and is still with her latest.
Basically playing games with the child (sorry about the lingo, I just don’t want to give too much details away about his child) calling me names, child was banned from calling him ‘Dad’ for some time which we went through a horrible period where she was full of fear and wetting the bed over calling him dad. Very controlling of child, has broken the court order many times. Will not let child go on holiday With us etc and if we take child out for an activity she tries to do one better every time. She’s been at the front row at her child’s work play practically shushing and threatening the child not to look or wave to her dad in the middle row. She has booked all the tickets on offer for such things and stood at the register where parents were booking in to see if me or my partner attends. That sort of controlling. Classic narcissist Who is very good at twisting her own actions to make it look like she’s the victim. She’s been caught out lying and being awful loads and still ends up getting away with stuff.
Ex wife has targeted me now. She stalks my social media where over time I’ve had to full on lock down all my profiles and be careful of what I post. It started when she found out me and my partner was dating - where she posted a picture mimicking a ‘copy’ of one of our pictures together with the added text of ‘I see all, I know all...’ 
Then she started mimicking other pictures too and claiming them as her own. She’s stolen my persona over time - she’s now suddenly changed her religion and become Jewish, a dancer, a hiker etc etc all in the past year. Quotes my Instagram profile ‘about’ are copied it as her own.
Mutual friends of her have noticed that she’s constantly trying to ‘outdo’ - if we go away and take some nice pictures of us on a hill, she will go with her partner and do the same on a mountain. Etc etc.
All this was funny but frustrating at first, I was half flattered until it started getting quite personal and weird. She’s done things such as bought my bedding etc and shown it off in pictures for people to see. My profiles are tight and I’ve had to get rid of loads of people off Facebook, Instagram etc because I feel like I’m constantly being spied on.
In September, she found out where I park when I drop my child off at school (it looks like by accident at first, I park in a public place where there is a shop and a petrol station. I have never in the past two years seen her there in the mornings or after school before. For the next few days it was daily, she would get out the car and make sure she was spotted by me - false laughing and hair swinging etc. My anxiety was through the roof as my child noticed too and got scared (she knows that shes a nasty person as her child is very close with mine like sisters and tells her things she has said and done).
This went on until early October when I started taking pictures of her car. I was considering going to the police over it, but wanted significant evidence of it before I did because I didn’t want to come across paranoid or like a right fool over it! Sometimes she was in her boyfriends car, and they would park and she would nip in to the shop. I know that the poor guy is oblivious to all of this. My partner went through it when he was with her - every situation manipulated and controlled, and when she was ever confronted It was an ‘I’m too nice I deny everything’ act.
The stalking at school stopped when she saw me taking pictures of her car. She has been caught out spying on my partner too when he was at the shop which was frightening to see. She also recently intimidated my best friend who’s children go to her child’s school by waving at her like a loon in the playground. I have no idea how she found out we were close friends but Saw that as another indicator she has been trying to find details about my life.
I came off Facebook last week after I’d had enough and within hours she had activated her old profile - with all her and my partners old friends and acquaintances on it - and put a photo of them on their wedding day as her profile picture 
Then deleted all the comments of everyone who questioned it and started blocking people who challenged her.
It was horrible and hurtful and my partner has been receiving messages all week wondering if we had broken up and if he was back with her. We had a weekend away this weekend to get away from it all which was lovely but it was still there looming over is.
I snapped and sent her boyfriend the picture of her profile and basically told him to get her to strap it down and that she had gone too far and that I would go to the police with these stalking pictures if she carried on. He took a day or so to reply. He doesn’t have Facebook so would haven’t known about it.
She pretty much denied the stalking and didn’t have a clue which friend I was on about and told him her account had been ‘hacked’. He also said she has been receiving flowers and cards which look like my partner had sent them. Then turned the whole thing around to make it look like she was the victim and I quote ‘she just wants to be left alone by you and your partner’ 
I’m shaking as I write this I honestly can’t believe I’m going through this yet alone by a woman in her mid 30’s! It all sounds so petty but it’s been one too many incidents now that have been built up over time I’m still in two minds whether to go to the police about this now but knowing the sort of person she is I wouldn’t be surprised if there was a knock at the door off the police saying we are the ones who have been stalking now since I have mentioned it to them.
What do you do in this situation? I’m very happy in my life and my partner is a good person and a brilliant dad but she is like a shadow hanging over us watching our every move and it’s staring to have a huge affect on my mental health.