California is a “no fault” divorce state. You don’t need to prove that your spouse did something wrong, such as being unfaithful, to get a divorce. There are only two grounds for getting a divorce or a legal separation in California:
1) irreconcilable differences;
2) permanent legal incapacity to make decisions (this ground was previously known as “insanity”).
Almost all divorces are based on “irreconcilable differences”, which basically means you and your spouse are unable to get along and the marriage can’t be saved by counseling or other means.