Of course he doesn't want to hear how bad things are for you. He's more than pleased with himself because he's got 2 women vying for his affections - one to bankroll him and the other to get his leg over with - and he doesn't want anything to bring him down from his high.
You've talked to him on the phone while the ow has been listening in. The ow has heard you begging? How humiliating is that? And how much did that boost his over-inflated ego?
Don't degrade yourself for this total tosser a moment longer. Change your locks (it's an easy job - get your db to help you do it this weekend), don't dispense so much as one more single penny to the tosser and go completely no contact with him - and don't answer the phone/respond to any texts from him as you have no further need of his 'services'.
If you haven't done so already, bag his stuff up, put it outside your house and send him one final text telling him to collect it before the binmen call. Don't be tempted to peer out of the window or answer the door when he rolls up to cart it away.
If you follow the advice you've been given here and cut the tosser dead, it's a given that in the not too distant future he'll back spouting the usual old bollocks about having made the biggest mistake of his life, it's you he really loves, blah de blah.
Don't be fooled because the subtext is that the ow found him lacking and booted him out. Hopefully, by the time this happens, you'll have realised just how lacking he is and you won't want to go anywhere near her reject.
Of course you can't turn your feelings off like a tap, but ask yourself what feelings do you have for him? Living with him was as dull as ditchwater; unstimulating and unfulfilling and with only more of the same to look forward to.
If you're scared of being alone in the house, get a burglar alarm fitted and leave some lights on at night. But you're not alone, you've got your canine pal to cuddle and watch out for you and you've got pals here that you can 'chat' to in the wee small hours should sleep elude you.
He has done you a favour by leaving because you are now free for the first time in 15 years to start living life as it's meant to be lived - with brio.
Ask your neighbours for recommendations for builders - who knows, you may have a good one living nearby. In any event, get 3 quotes from firms and ask to see examples of their work/meet satisfied customers before you make a decision - again, this is something your db can help you with.
If you haven't done so already, clear his crap out of your bedroom and go buy yourself some new bedding and look foward to the weekend - the sun's shining and your future is now bright with promise.
Btw, him have a claim on your house? Not a chance, and if he were to try it on he'd have to lay a considerable sum down before any solicitor would take it on.