Read the extract below and answer the question
I am sorry, madam, I have hurt your kinsman,
But had it been the brother of my blood,
I must have done no less with wit and safety.
You throw a strange regard upon me, and by that
I do perceive it hath offended you;
Pardon me, sweet one, even for the vows
We made each other but so late ago.
(Act 5 Sc. 1)
''the vows'' refers to