<human>: Condense the text into a few key points

I'll try to explain a little, it's awfully convoluted.. I'm working for a start-up in tech, we'll say company B. He took some of the people from his last start-up that tanked, Company A, when he started Company B. Coincidentally while at Company A we worked for another one of his investments(made a website), Company S.

Now last week he finds out that an old employee from the original start-up(Comp A) has been helping his business partner from Company S work on a totally unrelated project. The business partner at company S, this is his dream project, and it's unclear if my boss is even invested in the dream project. The ex-employee did not ask for permission to work with the business partner, my boss likened this to "a guy asking his bro's permission to date his ex". btw the dream project is not competing with the current/last business.

So when asking about this dream project I got screamed at with how terrible this ex-employee was, and how what he was doing was 1) illegal 2) would get him fired at "any business across the country". So, is my boss right or is he full of it, is it illegal for an employee to talk to a business partner without permission? Or is it immoral/bad in any way?
<bot>: Can an employee legally talk to a business partner of their current boss, without asking for permission, to work on a project that is unrelated/non-competitive to the business they're employed at?