Because CHRIST said this in the written Gospel of the HOLY BIBLE that;
"There is no marriage in Heaven. All of you will be 'like angels' worshiping GOD day and night."
Friends, have you heard the term used in a weddings, 'marriage made in Heaven', said by Christians and even perhaps by a 'minister', when a couple gets married in the church. To tell you the 'truth this is a 'false testimony' of a 'carnal' Christian in 'lawlessness' practice, lack in Spiritual knowledge of the HOLY BIBLE and one can be also a 'minister' for GOD in the church but sadly a 'deceiver' to GOD's lambs and sheep.
This is not a judgement against them, but a 'caution' to watch out for them, even Christians who think and sound wise, please GOD's lambs and sheep, do not to follow or immitate them, for they are not your MASTER's 'voice' for you all to follow.
Actually the term 'marriage made in Heaven' are 'Spiritual' and to be understood 'spiritually' by a 'spiritually blessed' believer, is actually referring to 'CHRIST and HIS bride, the church'.
Couples getting married here on earth are actually taking part in the 'marriage made on earth' by GOD and blessed by GOD from the beginning written in the book of Genesis.
What is in Heaven, stays in Heaven and what is here on earth, stays on earth.
Thank you and may GOD the FATHER of our LORD JESUS CHRIST bless you all with HIS kindness and peace.