I think that friendship begins when two people trust 'their' (ale 'their' CO?) completely and talk 'their' (zle uzywasz tego slowa, trudno mi zgadnac co masz na mysli) everything. People 'which' WHO (bo people to sa ludzie, a ludzie to WHO) want to be friends must be trustworthy, loyal and friendly.
They must look for A person who will be A kindred spirit for them. True friendship should be cultivated because people must support (ale kogo?)
and be close. They should BE interested in THE life OF the other people - their
friends. Friendship can BE destroyed when 'investigate' (calkowicie zle slowo) 'to betrayal' (cos tu nie tak-tego nie rozumiem), people change, they can't communicate.