I'm going to sue my best friend when he shuts down the business he built.
Why do you want to sue him?
Because I have been working there for a long time.
Suing someone, especially your best friend, for closing their business is not right. If he is having to close his business, he is already going through a lot. Think about how upset he would be if his best friend decides to sue him.
It's not like my friend can't take care of himself. He has plenty of money.
Don't you think you might need your friend in the future for a job recommendation? If you sue him, he will likely not want to help you out and whatever money you might make in a lawsuit isn't going to last you forever.