Is your man secret? Did you ne’er hear say,
“Two may keep counsel, putting one away”?
In this quote from the text the nurse is asking Romeo whether or not they can trust Romeos serving man with the secret of Romeo and Juliet being together as perhaps she may think that it would be easier for Romeo to have someone from his ‘side’ to also know about the secret so that maybe in the future he may be able to cover for Romeo. Although later on in the text she says that a secret is better kept with two meaning that she now thinks that they shouldn’t tell Romeos serving man about the matter.