No I don`t think you would end up in hell especially if you repent.
God gives us guidelines to follow as caution.
You reap what you sow...
Therefore this new guy may not bring you the happiness forever and you may wake up asking yourself,
was it worth it?
God gives instruction so that we may prosper.
We must commit to his word in all things.
Once we put our faith and trust in him he does the rest.
He can turn a broken marriage into a happy marriage but we must die to self.
We must truly let go and let God and not become deceived by the things of this world.
children and family is beautiful and we must think of the entire picture before leaving our spouses.