Yeah, just because divorce is forgiven by God, doesn't mean there is just an open license to remarry.
I mean if asking forgiveness was all that was required, the prophets, Jesus and Paul wouldn't of had all those commands against remarriage. They'd of just said ask for forgiveness and move on.
We know you're allowed to remarry if the other person is dead, has cheated, or isn't a Christian and has walked away from you.(1 Corinthians 7: 15But if the unbeliever leaves, let him do so. A believing man or woman is not bound in such circumstances; God has called us to live in peace. 16How do you know, wife, whether you will save your husband? Or, how do you know, husband, whether you will save your wife? )