I haven't read the whole thread, just the OP's posts and a bit of skimming.
He has his own house that he can move back to immediately, so he leaves TODAY. It can be no hardship, he lived there until 6 months ago, it's as homely as it has ever been. As to the boiler, tough, it can be fixed whilst he's living there.
UNDER NO CIRCUMSTANCES should he be in the house without you being there, so no, his children will not be at YOUR house this weekend, they will be with him at HIS house.
Make sure the locks are changed, because he doesn't sound the type I would trust not to have had the keys copied.
As for "he said he will take me to court as he has rights as he's been living here." Total bollocks. He has no rights at all, just trying to manipulate you.
"He said he would report me to the social....but wot for I don't know???! He didn't answer when I asked him wot for." Ditto
"He said he will make sure his family hate me" I doubt that would be much of a loss if they're anything like him.
"I have nooone and I don't belong here or deserve to have this house as he helped me to move in" Yegods, he's really clutching at straws now!!
You've packed his stuff, put them outside the door and lock it. He leaves TODAY.