It isn't me who's saying it. Look at Matthew 24:21-25:
21For
then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.
22And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.
23Then
if any man shall say unto you, Lo, here is Christ, or there; believe it not. 24For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if
it were possible, they shall deceive the very elect.
25Behold, I have told you before.
You don't see that this plainly states that there will be great tribulation and that people will be saying that Christ has returned?
Pause a moment and think about that. You say Jesus comes before the tribulation. Jesus is saying that people will be saying during that great tribulation He has arrived and to not believe them. That would definitely mean that Jesus has not returned yet.
Jesus does not return until after this very same period of tribulation He describes in this chapter:
Matthew 24:29-31
29Immediately after the tribulation of those days
shall the sun be darkened, and the
moon shall not give her light, and
the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
The problem with your exegesis is you have Jesus returning before the great tribulation and the Bible says that absolutely no where. Go back and read everything very carefully and slowly. Pre-trib doesn't exist.