This is an action for a divorce. "Dissolution" is the modern day "politically correct" term for a divorce.
2. I don't really want a divorce, but my spouse does. Can I stop this?
Technically, you can object to a dissolution. However, California has been a no-fault state for many years now where most of the divorces are granted based on the ground of "irreconcilable differences." Therefore, the practical result is that, if one of the parties desires a divorce based on irreconcilable differences, then the divorce will be granted. Accordingly, the question would not be "Will a divorce occur?" (it likely will), but, rather, "How will the divorce occur?" (i.e., mediation, collaborative practice, litigation, etc.)