No one can say how they are true or wrong, since no verification basis was given. For example, that 'no one is met in vain': there's no general criteria of when someone is met in vain and everyone will use their own definition. There's no accepted standard of 'met in vain', therefore whole sentence can't be proven right or wrong.
"In relationships you get what you give" - Life is full of examples that proves it wrong.
Etc.