That is just the bottomline of the whole process of entering into any form of partnership,one need to know the character of te friend he wants to go into partnership with,and you must share the same values as well.Many people see patnering in business with other people as a bad thing to do because they have seen far more worse thing and how heart breaking it can be , but looking at the bright side of it , if you have a trustworthy patner , you are going to enjoy patner in business .