Where was Paul supposed to meet Titus who never showed up?

Les explains that Paul had arranged to meet Titus at Troas, on western Turkey, the site of ancient Troy. Paul arrived, and when it was time to leave, Titus still had not come. Because they lacked modern communications, Paul had no way of knowing what had happened to Titus, and this weighed heavily on him. Les then notes that Paul ended up sick in Philippi, and when he crossed from Asia Minor over the Aegean to Macedonia, his flesh had no rest and he was troubled on every side. In verse 6 Paul points to God, who comforts those cast down. Les applies this by contrasting modern reliance on psychologists and counselors after tragedy with the Bible's message that God is the source of comfort.