Any advice gratefully received.
The only advice I can give you is his messages are still all about him and his needs.
You didn't want the relationship to end you just asked for some consideration in how your home is treated by his DC and for your DP to consider spending some time with you, not expensive holiday's or meals out......just a walk, maybe stopping for coffee or a pub drink, but no he couldn't even afford you that...not even a 'left over crumb' of his time.
You asked him to give you space...
His answer to you is to not do as asked, or understand how you feel or even acknowledge that his DC should respect your home but to just tell you if you can't accept him and all that goes with him in their own ways he's ending the relationship but it's all on you, all your own doing...
He's really showing that he isn't capable of comprising, your feelings don't even matter to him, to him there's no other way but his own.
With his wage he can rent a house big enough for his own DC, after all as a parent that's his job to fulfil and not for him to pass on to you while keeping his ex well funded and happy.