A lot of people would argue that they don't get "marred" at all--that they are as morally pure as they were at the beginning. Or did you mean "married"?
The wedding of Romeo and Juliet is not depicted in the play and so no act, scene or line can be given for it. There is a reason for this. Marriage was and is a sacrament of the Church, and it was illegal to portray an actual sacrament of the Church. It was considered to be blasphemous.
These lines are spoken by Juliet in Act 2, Scene 2 of "Romeo and Juliet." Juliet is expressing her love for Romeo and her desire for him to stay with her even though she knows it is dangerous for them to be together.
Capulet said this in Romeo in Juliet. ( Act 1 Scene 2. )
Romeo said it in "Romeo and Juliet," Act 2, scene 3, lines 4-8.
There are five scenes in Romeo and Juliet which are scene 1.
the best scenes are the balcony scene and the last scene (when Romeo and Juliet die)
Foreshadowing
Their first lines together, in scene 5, form a sonnet.
In Act 1 scene 2 Paris asks Juliet's father if he can marry her. However, in Act 1 Scene 5 Romeo also starts getting ideas along those lines.
Juliet says it to Romeo in Act 1, Scene 5 of "Romeo and Juliet" by William Shakespeare.
in the final scene, both romeo and Juliet die.
Susan. Act 1, Scene 3, Lines 20 and onwards
Everything Romeo says during the balcony scene when he is spying on Juliet is an aside. I'm thinking of such lines as "she speaks!"