It is not uncommon for one spouse in the marriage to be the one who decides they want to get divorced while the other wants to stay together.
And while there are countless reasons someone seeks a divorce, none of them matter in the state of California, since we are a no-fault divorce state. That means one spouse does not have to prove the other did something wrong to dissolve their marriage. They must simply state that they can no longer get along, or what is technically referred to as irreconcilable differences.