Why are you even still thinking about the house situation? It's over, he's made his bed now let him lay in it. He also turned into the exact money grabbing mentally manipulating monster that we all said he was before you had even realised.
You've only got until the end of the day to work with him, then you've two weeks off. In that time, i'm sure that if you speak to your Boss, explain that he is harassing you, even though that he broke it off with you, he's still making it very difficult at work and at home at the moment & you've even considered contacting the police if it gets any worse. You would like a change of station or at least a change of shout, if this can't be facilitated your going to get your union involved (i hope your in a union).
Think about nice things, Christmas is coming up, think about how your going to decorate your flat, what your going to buy your parents and ?siblings? Stop focusing on the negatives, try mindfulness to help relax the mind. Tell him that you'll pay him after Christmas, take it or leave it, don't contact me again etc. Delete his number, email address and already have a cheque or similar organised for paying him in the new year.
Hopefully within the two weeks, work will have sorted alternative work out for you & life will be merry and bright in more ways that one 