Hello and thank you for entrusting me to assist you. My name is ***** ***** I will do everything I can to answer your question.
I can understand your frustration, but unfortunately, none of what you describe gives rise to any legal claims. The reason is because employment in the state of CA is "at will" absent an express agreement to the contrary. At will employment can be terminated or modified for any reason not amounting to discrimination on the basis of a legally protected trait (race, religion, gender, etc.) or retaliation for engaging in certain forms of legally protected conduct (filing a wage claim, taking FMLA leave, etc.). It doesn't matter whether the basis for termination is fair, reasonable or even true.
Thus, while it would be completely unfair to terminate you or change your job because of an argument your fiance got into with your management, it is not against the law. What you are describing sounds like some very petty office politics, but it is not illegal to engage in office politics or to take out personal vendettas like this.
So, all you can do is continue trying to get back on the schedule and apply for unemployment benefits in the mean time. You don't need a formal "termination letter" to apply for benefits. See here to start your UI claim: https://eapply4ui.edd.ca.gov/
I hope that you find this information helpful and am genuinely sorry if it is not what you were hoping to hear. Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
If you do not require any further assistance, please be so kind as to provide a positive rating of my service so that I may receive credit for assisting you. Very best wishes moving forward.