word meanings:

protagonists = main characters.

inability to control his emotions = has issues.

acts rashly = does stupid things.

impulsive = same as above.

romeo thinking fate controls him.

O, I am fortune’s fool! said after he kills tybalt, he is saying that he thinks fate is responsible for tybalts death even though he literally just stabbed him.

Is it e’en so?—Then I defy you, stars!, this is after he hears that Juliet is dead, he is saying that he had a plan so that he and Juliet spend forever together. (death).

I still will stay with thee
And never from this palace of dim night
Depart again. Here, here will I remain
With worms that are thy chambermaids. O, here
Will I set up my everlasting rest
And shake the yoke of inauspicious stars
From this world-wearied flesh! this is when romeo is talking to fake dead Juliet, he thinks that he make fun of “the stars” (fate) by killing himself and spending forever with Juliet.

romeo being an impulsive moron and making everyone die.

on example of romeos impulsiveness is when one day he is in love with Rosalie and the next he is married to Juliet the day after meeting her, this directly leads to romeo and Juliet dying.

another is when he kills tybalt in anger after he kills mertuchio this leads to romeo being banished and him and Juliet dying. this is similar to what happens to pairs.