Communication is the key. Work things out or walking away may just be the best thing you do, before things get worse.
“I can’t control your behavior; nor do I want that burden… but I will not apologize for refusing to be disrespected, to be lied to, or to be mistreated. I have standards; step up or step out.”
— Steve Maraboli
How to say no to a bad business partner:
Clarify motives from the very beginning.
Force them to be truthful.
Create a partnership dissolution agreement.
Make sure that you can communicate professionally with a potential partner before saying “yes” to them.