to place trust in someone is to have complete faith that whatever the person decides to do is what they want to do after considering every single factor.
to trust someone is to have complete faith that that person will act based on his/her own best interest.
sometimes it is hard to trust someone because of the biasness one holds, however, we need to have faith in that person and in Allah SWT that at the end of the day, everything will be fine.
let the person know that you have his/her back and that when they fall, you are there to catch them, regardless.
that is the least a friend can do.
may Allah SWT guard all of us from trials and tribulations.