Which lines in this excerpt from act V of Romeo and Juliet show that Romeo feels guilty about having killed Juliet’s cousin Tybalt?

A- 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:

B- 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!

C- 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,

D- 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!