Legal Question in Employment Law in California

So???

in general, unless an employee is civil service, in a union, or has a written employment contract, they are an 'at will' employee that can be disciplined or terminated any time for any reason, with or without ‘cause’, explanation or notice.

Even beyond that, you gave the employer 'cause' to terminate; you proved you were not interested in staying at the company and were planning to quit, by seeking other employment.

You probably still qualify for unemployment benefits though.