Hi Tygoon,
Thanks for writing in and sorry to hear about this news. This is a really tough one -- some schools may indicate that you are required to update them of any significant changes in your job status, and this would certainly qualify under that. And most schools will do full background checks upon admittance/your acceptance, so this would definitely come out then.
My advice would be to write a short letter to the admissions office of the schools you applied to. Try not to focus too much on the boss not liking you and the reasons being "stupid," but rather you can state you are no longer employed there and are awaiting your next career move pending the result of your application.
You want to avoid having this come up later in the process and potentially leading to a revoked admissions offer.
Good luck!
Daniel Richards
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