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I am sorry to see this is happening. Since he has moved out, you need to act immediately to protect yourself. As harsh as this sounds you need to get to a local family law
attorney immediately and get them to file for divorce
and a motion for temporary possession of the marital home, which will prevent him from returning right now. Once you do that, you can seek to protect the assets you have by removing them from any joint named accounts and putting them into an account in your name only for now.
As CA is a community property
state, you are ultimately going to have to split all of the property acquired during the marriage
50-50 pursuant to CA law, it is better that you have control over the money until the court orders the division of that money.
I know this sounds drastic, but you need to protect yourself.
Since he bailed on you, the chances of him being able to get spousal support
will be greatly reduced, but again he is going to be entitled to 1/2 of all of the property from the community eventually, so being proactive now will put you in the better position later on in the process.