How does the suicidal impulse that both Romeo and Juliet exhibit relate to the overall theme of young love? Does Shakespeare seem to consider a self-destructive tendency inextricably connected with love, or is it a separate issue? Why do you think so?

As a more simple answer to your question, Shakespeare shows that young love is an 'all or nothing' proposition. When Romeo is told by the Friar that his punishment will be banishment, and not death, Romeo replies that there is no world for him outside Verona.

There is also a measure of idealism in their love. Juliet and Romeo refuse to bend to the reality of their family situation, believing that love will conquer all.