Wow ADM, I have a kinda different view here. One thing in my mind that needs to be clarified, is why was the party at his ex wifes house? Did they have a child together?
If so, it seems kinda unfair to make that an issue to walk out and move 800 kilometers away over. To be honest, if my wife did that to me, I'd pack her stuff up and change the locks too. You also seem too focused on his past and his mothers past. That might explain some of it, but it's really of very little use "In the now" so to speak.
As for the furniture you paid for, keep in mind you left it. You're angry the other stuff was packed off, yet also angry that the furniture wasn't. It sounds kind of like your Husband was "damned if he did, damned if he didn't", to be honest.
It sounds kinda like he might be trying to make some sort of effort, actually. He put it up for safe keeping. Some people (like my ex) would have sold it or simply carried it to the curb.
You mention you have left before. Leaving a lot isn't good. I can tell you from a mans point of view, the woman you love leaving is scary. And I also know that if it happened fairly often, I'd get weary of the roller coaster.
Maybe I'm reading this wrong, admittedly, but even your version of events makes me feel a little like your husband might not be as out-of-line as you say he is. I can say that moving 800 kilometers away with my son over a fight about a Family Easter party would really tick me off, even if I was out of line about the party. Did your Husband and his Ex have a child together?
Life may be short, but . . . well . . . it actually IS short, now that I think about it . . . . particularly when compared to planetary formation and stuff.