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Kylie Jenner's split from Travis Scott wasn't the result of a cheating scandal or a blowup fight ... they were simply done in by a harsh dose of reality.

Sources close to the ex-couple tell TMZ ... their decision to break things off came weeks ago, following a very long honeymoon phase that was full of love, touring, going on vacations and of course ... raising their daughter, Stormi, together.

We're told after Travis' "Astroworld" tour wrapped up and the two got back from Kylie's lavish bday getaway, everything slowed down and they were confronted by the grind of normal life ... and things felt different between them.

Simply put ... our sources say they fell out of love.