I left my former employer a little over a month ago. I received a certified letter in the mail today from their attorneys office telling me that since I am still friends with one of my former cutomer's employees (The named the customer and employee by nam

My former employer is saying that I signed a Confidentiality agreement, I may have but I have never been provided a copy. I got a letter in the mail from my former employers attorney, stating that they demand I cease and desist my communication with (customer name) including but not limited to their employee, (employee name). The employee that the letter is referring to has been a friend of mine outside of work for well over a year. I have not given that employee any information that could hurt my former employers business. The letter also says if I continue to contact and discuss protected information with customers of (former employer), and I do not cease such contact with the customers a lawsuit will commence.

So am I not allowed to stay friends outside of work with anybody that I had contact with while I was an employee?

Should the company and employee being referred to in this letter that I am supposedly giving information to also receive a copy of this letter?

The letter says I have to send a letter back agreeing to what they are warning me of within so many days, how do I reply?

Please help I don't know what to do.