# It is not to condemn you that I say this

"I do not say this to accuse you of having done wrong." The word "this" refers to what Paul just said about not having wronged anyone.

# you are in our hearts

"you are very dear to us" 

# for us to die together and to live together

"whether we live or whether we die" 

# for us to die

"us" includes the Corinthian believers.