Your partner started a second company. You learned about it from a customer, not from him, and now you notice that the easy jobs still come to your shared business while the lucrative ones quietly go to his. He says there is nothing wrong with a little outside work. You suspect he has been competing with the company you own together, using its people and its relationships to do it. The question is whether the law sees a betrayal or just ordinary business.
In Illinois, partners and co-owners are not strangers dealing at arm’s length. They stand in a fiduciary relationship, the most demanding standard the law imposes outside a trust, and conduct that would be unremarkable between competitors can be a breach between partners. Knowing where that line sits tells you whether you have a grievance or a case, and it is just as important if you are the partner being accused.