I would express my feelings in an honest and open way by saying that what he did and his failure to pay for the damages was the reason why the friendship ended. Give him a chance to reflect on that and see if he does apologise.
The above being said, I would offer up my support and say I will be there for you as you battle this Cancer. I'm not a person who holds grudges and would have a hard time saying no to someone whom I knew was dying from Cancer.
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