As far as the house goes, hopefully your name is on the title. In either case, moving out doesn't screw you, but see a lawyer and real estate agent asap.
Your things are your things, hers are hers. If you gave her a gift, then it is hers and vice versa. If she smashed something of her own, regardless of whether you gave it to her or you were yelling at her at the time, it is her problem.
- You can cut the bills, if you had kids or your ex was a dependant then you could get screwed, but if she works then she can pay for her own bills.
- You should immediately make a list of all your possessions, the ones you brought into the relationship or bought by yourself. Make a second list of things you bought together. Take photos if you can. Present copies of the lists to her. Pack your stuff and move it out as soon as you can, make sure you take nothing of hers, and only take joint items if she agrees and signs off on the item on the joint list. If she gives you a problem about any item, photograph it, itemize, and tell her you will work out a cash value during the equalization process, it's not worth fighting about now. Do all this with a friend there with you, not alone, and if possible record all conversations. It doesn't matter if you think she will never do anything (accuse you of theft, assault, etc), cover your ass always, especially since you are recently in high conflict.
- I have read stories about people spending tens of thousands of dollars fighting over custody of the dog. It's up to you how badly you want to fight, or if you could just get another dog.
- If there was already "an incident" then you are right to leave because there will just be more incidents.
- In the long run we are screwed. Dust in the wind.