Could of Should of
Would it have been so hard for you to say you're sorry
Would it have been so hard for you to apologize

I could have
I should have
I could have
I should have

Would it have been so hard for me to say I'm sorry
Would it have been so hard for me to apologize

I could have
I should have
I could have
I should have

Would it have been so hard for us to say we're sorry
Would it have been so hard for us to apologize

I could have
I should have
I could have
I should have