How have the differences between romeo and juliet returned to threaten their future together

Both families hate each other, but R falls for J and vice versa. This causes R to kill T in revenge for M's death and he must leave to some shanty-town; T doesn't like R, vice versa, and despite R loving J and therefore wanting to love her family, he can't bring himself to forgive T for M's death and it might because of R's family hating J's family. J wants to find a way run away with R and decides to fake her death since her family cannot forgive R and R did commit a murder that should be paid with his own head. A letter is sent, but R doesn't get it since he decides to return after hearing of J's "death". He ends up fighting P who was to be J's husband and commits suicide. J wakes up and finds R dying and kills herself too so they can both be together forever. The whole "I hate you" is the reason why they both died. They could of ran off together, but their families would track them down and blame the other which would probably lead to both of R's and J's deaths. Hatred leads to M's, T's, and P's death since M was hated for being friendly with R's family, T's death was in revenge and perhaps a subconscious hatred of J's family, and P's death came from P blaming R for for J's "death" and perhaps a hatred for R's family as well. Basically, this story is about stupid things screwing over stupid, but nice people.i hope this answered your question:)

Both families hate each other so they can’t be together no matter how much they love each, but they don’t care about that which is going to draw a ledge between Juliet and family and Romeo and his family