1Co 7:27 Art thou bound unto a wife? seek not to be loosed. Art thou loosed from a wife? seek not a wife.
1Co 7:28 But and if thou marry, thou hast not sinned; and if a virgin marry, she hath not sinned.
Paul says if you remarry, you have NOT sinned...
You picked the reference to one who was engaged, but not married.
Let’s look in context:
From the NIV:
Concerning the Unmarried
25 Now about virgins: I have no command from the Lord, but I give a judgment as one who by the Lord’s mercy is trustworthy. 26 Because of the present crisis, I think that it is good for a man to remain as he is. 27 Are you pledged to a woman? Do not seek to be released. Are you free from such a commitment? Do not look for a wife. 28 But if you do marry, you have not sinned; and if a virgin marries, she has not sinned. But those who marry will face many troubles in this life, and I want to spare you this.
It is wrong to remarry while your spouse is alive, if you were divorced.
He says nothing about “remarriage” in that verse. That just you reading your errors back into Scripture.