I got married once in my life but have had numerous girlfriends before I became Christian. I felt Jesus at the wedding telling me in the spirit that Jesus supports marriage and that it is important. Whether or not you have become one flesh with someone you're not married to is another issue. The bible talks about adultery and fornication. Those terms are used differently than marriage. And the only reason for divorce proclaimed by Jesus is a spouse that cheats. Let's examine some scripture about marriage surrounding Jesus the Christ:
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During a wedding in Cana of Galilee, Jesus, at Mary's request, transforms approximately 120 gallons of water into wine, the quality of which is highly praised by the ruler of the feast. Jesus chose a wedding to perform His first miracle, doubtless
to emphasize the sanctity of marriage."
https://digitalcommons.liberty.edu/cgi/viewcontent.cgi?article=1098&context=second_person
Revelation 19:
6 Then I heard what seemed to be the voice of a great multitude, like the roar of many waters and like the sound of mighty peals of thunder, crying out,
“Hallelujah!
For the Lord our God
the Almighty reigns.
7 Let us rejoice and exult
and give him the glory,
for the marriage of the Lamb has come,
and his Bride has made herself ready;
8 it was granted her to clothe herself
with fine linen, bright and pure”—
for the fine linen is the righteous deeds of the saints.
9 And the angel said to me, “Write this:
Blessed are those who are invited to the marriage supper of the Lamb.” And he said to me, “These are the true words of God.”