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He wasn't suppose to until the end times according to the prophets and according to his own words. His desciples asked him when the end times would be. He answered by corroborating the OT prophets that the Jews would be scattered globally and return in the latter days/end times.
Interestingly enough two out of three accounts of the prophecy you are referring to make absolutely no mention of any such thing - and the third is quite different from the other two. So there's no way to be sure that Jesus said it at all.
All of the accounts strongly suggest a time limit of a single generation - from the time the prophecy was spoken. Even if we take the dubious approach of interpreting that a meaning that all the listed signs will take place within a single generation then the exile and return must BOTH occur within that timeframe.
Thus we can be sure that this prophecy failed.