‘But not even Titus who was with me, being a Greek, was compelled to be circumcised.'
‘With me.' Titus was there as a companion of Paul and Barnabas. (‘With me does not necessarily exclude Barnabas. Paul is simply describing a fact. He is talking to the Galatians about himself and speaks of Titus as having been with him). Because of this Titus was in the limelight and pressure was brought by Judaisers to insist on his circumcision. It was a crucial moment, and Paul points out that neither the Apostles nor the Jerusalem leadership required that he be circumcised. (Paul did not object to the circumcision of Timothy (Acts 16:3), for Timothy was half Jewish, and it was felt that his being circumcised would help their ministry among Jews. But in his case there was no matter of principle was involved because of his Jewish background and upbringing).
Titus was a Gentile believer and one of Paul's faithful helpers in his ministry. When Paul wrote this letter Titus was apparently living in Antioch. Later he went at Paul's request to the Corinthian church (2 Corinthians 2:12-13; 2 Corinthians 7:5-16), to the Jerusalem church (2 Corinthians 8:6-24; 2 Corinthians 9:3-5; 2 Corinthians 12:18), and to the Cretan church (Titus 1:5).