Which lines in this excerpt from act v of romeo and juliet show that romeo feels guilty about having killed juliet’s cousin tybalt?
romeo: in faith, i will. let me peruse this face.
mercutio's kinsman, noble county paris!
what said my man, when my betossed soul
did not attend him as we rode? i think
he told me paris should have married juliet:
said he not so? or did i dream it so?
or am i mad, hearing him talk of juliet,
to think it was so? o, give me thy hand,
one writ with me in sour misfortune's book!
i'll bury thee in a triumphant grave;
a grave? o no! a lantern, slaughter'd youth,
for here lies juliet, and her beauty makes
this vault a feasting presence full of light.
death, lie thou there, by a dead man interr'd.

(laying paris in the tomb)

how oft when men are at the point of death
have they been merry! which their keepers call
a lightning before death: o, how may i
call this a lightning? o my love! my wife!
death, that hath suck'd the honey of thy breath,
hath had no power yet upon thy beauty:
thou art not conquer'd; beauty's ensign yet
is crimson in thy lips and in thy cheeks,
and death's pale flag is not advanced there.
tybalt, liest thou there in thy bloody sheet?
o, what more favour can i do to thee,
than with that hand that cut thy youth in twain
to sunder his that was thine enemy?
forgive me, cousin! ah, dear juliet,
why art thou yet so fair? shall i believe
that unsubstantial death is amorous,
and that the lean abhorred monster keeps
thee here in dark to be his paramour?
for fear of that, 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 chamber-maids; o, here
will i set up my everlasting rest,
and shake the yoke of inauspicious stars
from this world-wearied flesh. eyes, look your last!
arms, take your last embrace! and, lips, o you
the doors of breath, seal with a righteous kiss
a dateless bargain to engrossing death!
come, bitter conduct, come, unsavoury guide!
thou desperate pilot, now at once run on
the dashing rocks thy sea-sick weary bark!
here's to my love!