What are they asking for in their suit? Money damages? An injunction? Your company apparently put you in a position where you had a good likelihood of failing. Who would want to work for a place that was that dishonest? It must have been awful going to work every day and not knowing what you were supposed to know in order to do the job.
I recommend that you talk to an employment lawyer. Again, I don't know what your old company is asking for in the suit. However, there is something called the "clean hands doctrine," meaning that if you sue somebody in a court of equity (i.e. asking for something other than money damages) you had better not have done anything underhanded yourself. Your lawyer can tell you if the suit contains equitable remedies rather than just money damages. Good luck to you.
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Sorry, the fake resume of 6-7 years experience is not something that I understand. More information is necessary to answer your questions. The physical and emotional stress would have to be pretty bad to be a good reason to breach what appears to be a breach of contract action against you for leaving the company early.