1.Friar Lawrence shows loyalty to Romeo by advising him to take the marriage slowly. He cares enough about Romeo to listen to him groan about Roseline and does his best to make Romeo think realistically about his new love. Although he scolds him, he still approves of the marriage because it would end the families' feud which would be the best for everyone.
2. The Nurse shows loyalty to Juliet by keeping her best interests in mind. Even though she knows that Romeo is a Montague, she keeps it a secret and gets the news from Romeo, and when she does, she still warns him to not to take advantage of Juliet. The fact that Juliet trusted the Nurse with this secret rather than tell her own parents shows how caring for Juliet for most of her childhood strengthens the Nurse's loyalty to Juliet.
3. Although Romeo and Juliet are infatuated, through their marriage, they display a longer lasting loyalty. Their marriage is short lived and they face many challenges throughout the story, but they never turn back on what they say in this scene. Even when it seems like fate is trying to pull them apart, they still stay loyal to each other from their marriage to their deaths.
"Young men's love then lies not truly in their hearts but in their eyes."(2.3.71-72)
"Wisely and slow. They stumble that run fast."(2.3.101)
"if you should lead her in a fool's paradise"(2.4.169)
"Unfold the imagined happiness that both receive in either by this dear encounter"(2.6.28-29)
But my true love is grown to such excess I cannot sum up sum of half my wealth." (2.6.33-34)