California Employment Law
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Hello and welcome to JustAnswer.
I'm sorry to hear about your situation and hope I can help.
Yes, you can sue for intentional interference with economic relations if your boss directly caused the contractor you were contracting for to end its relationship with you.
You would need proof that your boss caused the contractor to end its relationship with you, likely through statements from the contractor.
Although you do have this cause of action, it is a hard one to prove, and bringing it against your current employer could (obviously) damage your employment relationship with them, so it's not one I would strongly suggest that you pursue.
However, if you are interested in taking to a local attorney about your situation, I suggest one of the following websites:
Please let me know if you have any follow up questions.