I just wanted to say I noticed how some posters, were mentioning nothing wrong with the weekend away, without mentioning once that it wasn't just any casual weekend away, but that weekend away is a few days before christmas and if there is snow, OP could be left alone by her partner at christmas.
Is that really so normal and usual?
If my MIL was really ill, alone, couldnt get to us and had a crisis then my DH and I would discuss it and decide whether to go or not.
He would never casually go and see him mum just before christmas, when there was a chance he may get snowed in
and leave me, alone.
I also understand the Easter card, its another little dig at you op, I have this too, long messages written to everyone else, with me, no name written, just a scrawl signature, like I am the postman.
Anway, the bottom line here is he does not seem to respect you anymore. All you can do is find out more advice from elsewhere.
You also need to understand that your needs and the prospect of you being homeless is no less important than your pils being homeless. Difference is, if you are made homeless, its not because you had no cash is it...
Time to toughen up.