Maybe it's fornication or maybe it's adultery. I really don't care about which one it is. The Bible states that people who commit either one will go to hell. That's good enough for me! It seems to be saying that if you marry a divorced person then there is a sin of adultery or fornication happening.
1 Corinthians 6:9-10 New King James Version (NKJV)
9 Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor [a
]homosexuals, nor [b
]sodomites, 10 nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God.
Some people think that all you got to do is "repent" translation, "just tell God your sorry" and all is well. Some other people say you must go back to your original mate.
Most likely I'll never meet the "right woman" to marry, so therefor I'll probably never need to worry about this stuff.