https://www.btstories.com/2nd-letter-to-the-corinthians-2/

This second half of 2 Corinthians is the most personal of all of Paul’s letters. Its purpose is to restore the relationship between him and the church before his upcoming visit. He continued by saying:

When I got to Macedonia, I was constantly thinking about you. I still didn’t know how you responded to my letter. But then I found Titus, and his report made my heart leap for joy! He told me how you loved me and wanted to do right. He said my letter caused you grief, but a godly grief. It led you to repent and continue your walk with God. My rejoicing has never been so full.