Honestly @whattodo12345 use this thread as much as it helps - I also kept a piece of paper on my fridge with a list of upsetting things that my ex had done during our relationship and when I left him. It meant I saw it lots of times a day so it was front of mind.
You basically need to make sure that at be moment your focus and priority is it ending and the reasons why this is important.
This goal needs to be front of mind so that he doesn't have any cracks to slip through and get your guard down again.
This all seems so unfair....he ruins my life yet he gets to just carry on and woo some other girl
It is unfair but life is really fucking unfair, but fortunately this is a situation where you have the opportunity to take control of your own actions at least.
I have to be honest - the fact that him wooing another girl is even on your radar and upsetting you at the moment is very troubling.
I'd expect you to be saying something more like "it's so unfair, he ruins my life because now I'll feel scared loads" etc.
Make yourself, your safety and your future the priority.
He might start trying to make you jealous as another tactic so you need to really try to get your guard up as highly and firmly as possible ASAP so this doesn't work if he tries!
If you were a friend of mine IRL I would be suggesting a chat to women's aid or even (if you can spare the cost) a counselling session or two to help just get your thoughts collected and a plan in place.
When I was being stalked my gym gave me three months out on my contract, didn't pay so couldn't go but wasn't out of pocket. This happened because I explained the situation (very discretely) to the head office customer relations people, not the gym manager so I didn't have to let anyone know IRL.
Loyal customer who has always paid on time so they didn't mind at all. I used the money I saved for a few counselling sessions. Worth a go 