Earlier quoted context omitted.
Paul predicted the end the world to arrive in his lifetime. He was wrong. See: 1 Thessalonians 4:15-17
No, Paul is addressing the church, then and now. His use of the word "we" in the passage you quote has that sense. It's characteristic of Paul, see Ephesians 2 for another example. To come back to your point, if you read the rest of Paul's letter to the Thessalonians, you will find Paul's position (which is in fact Jesus' position) on the matter: "Now, brothers and sisters, about times and dates we do not need to wri…
What does this even mean? Jesus never mentioned Paul, and Jesus and Paul never even met.