In Elizabethan society, a man thought to be too much in love, lost his manliness, what lines from Romeo echo this belief? Was this belief seen in Much Ado About Nothing?

If any character emasulates himself, it's Romeo. He is pretty obsessed with the idea of love that he has floating around his addolescent brain,

Love is a smoke raised with the fume of sighs;
Being purged, a fire sparkling in lovers' eyes;
Being vexed a sea nourish'd with loving tears:
What is it else? a madness most discreet,
A choking gall, and a preserving sweet. Act 1

It takes the death of his best friend to make Romeo snap out of his morose love problems.

Much Ado about Nothing is a very different type of play. Where Romeo and Juliet is a tragedy, Much Ado about Nothing is a comedy. The men have more leeway to muse about love. Their love, however, has a darker back to it. Hero infatuated Claudio but that infatuation quickly turned to scorn over nothing more than a well-placed rumor. Unlike Romeo, Claudio was not given the time to be a hopeless romantic.