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 perceieve it hath offended you;
Pardon me, sweet one, even for the vows
We made each other but so late ago.
(Act 5 Sc. 1)

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''the vows'' refers to