Answer:
I think that this needs more context for me to answer well, but the quote means that it's your choice whether or not (he) is near the end of (whatever it may be) Again, I need more context to know where this is from or what it's about to give you a full response.
Romeo does not want to fight Paris. He has no desire to take up arms against Paris; however, if Paris chooses to fight him, he will fight back. Romeo is characterized as noncombative. He doesn't want to fight Paris. We have seen this in other parts of the play as well. He did not want to fight Tybalt when Tybalt came at him. This choice was not a surprise because Romeo had shown to be rather passive in conversations about the fighting between the Capulets and Montagues. He never seemed to condone the fighting in the streets and seemed to stay out of the skirmishes. Romeo also comes across as very confident in his abilities as a swordsman. His statement that the fight will put "another sin upon [his] head" indicates that he is confident he will kill Paris if they fight.
