They know your weaknesses, your family’s issues, your failures, your insecurities, and it might hurt the relationship if things don’t work out.
On the other hand, if they know your weaknesses then they won’t be surprised by them. If they know your family’s issues, they’ll be more sensitive when they come up. If they know your failures, then they’ll know how to help you avoid repeating them. If they know your insecurities, they’ll know how to encourage you to try again.
Finally, working together might hurt the relationship, but not if you’re honest with each other from the beginning.
I like working with friends because your best friends tell you the most truth. (highlight that sentence to share it). I want to work with someone who cares about me and tells me the truth.
Ignore the headline. Work with your friends.