Hiya.
Sorry to hear, hope you are alright, you sound mostly alright..
My top tips I guess...?
Be prepared for a weird start - weird Sundays, nights out coming home alone, no one there to call, can't call him anymore, everything has changed and what is this new normal? I shaved my legs for this? etc
But it will settle, I promise.
Dream out the next stage. I have looked back on single stages between relationships and wished I'd done more. Now I do make sure I use the time. Anything and everything you want to do - do it now. Plan stuff, buy tickets.
Enjoy the inevitable weight loss. ;)
Recognise that you are a step closer to what will really make you happy. This guy can't have been right. What do you want next? Think it up.
Oh, also, minimise contact with him. It might take a while, but it will start to feel wrong so then, accept that you might need a year or so's total break to then re-emerge on a different setting. And he might get a new girlfriend or you a new boyfriend, which will be weird.
X