"Hey, I am perfectly cherishable," Tony mutters, because he's never been very good with serious conversations. Something in Bruce's admission had hit Tony like a dull ache in his chest, the idea that Bruce's goal was to make sure that Tony and Pepper could stay together. Even though Bruce had presumably loved Pepper. Tony doesn't know what he did to earn such devotion - it's probably all Pepper, as things usually are - but he's grateful all the same.