Paul says Titus was not compelled to be circumcised, even though he was a Greek. He frames this as resisting pressure from “false brothers” so that “the truth of the gospel might be preserved” (Galatians 2:3–5).
Paul describes a later trip to Jerusalem, bringing Barnabas and Titus, and says the visit put his message to a real test. He explains that he went because of a divine prompting and presented the message he preaches among non-Jews, especially to the recognized leaders in a private setting. Titus, a Greek, was not forced to be circumcised. This unit continues Paul’s personal story that began earlier, where he argues that his mission and message did not originate from human authorization (Galatians 1:11–12).
Paul uses this Jerusalem visit to show that his message to non-Jews was not a self-made invention and was not supposed to be reshaped by pressure. He says he went because God prompted him (“by revelation”), and he presented the same message he was already preaching among the Gentiles (gospel).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Galatians 2:3-5, then read the surrounding section so the answer stays connected to the passage's flow.
3But not even Titus, who was with me, being a Greek, was compelled to be circumcised.
4This was because of the false brothers secretly brought in, who stole in to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage;
5to whom we gave no place in the way of subjection, not for an hour, that the truth of the gospel might continue with you.