Because you seem focused on "forgiveness", I think you may need to exercise caution. There is nothing wrong with making amends with your ex, and forgiveness is certainly a wonderful thing. However, you should be careful to consider what caused you to divorce. Are those issues still present? Will they always be present, or can they be resolved? Was there any serious dysfunction in the relationship? It would be a bad idea to go back into the relationship if you will just end up experiencing the same problems and splitting up again. As long as you are carefully thinking about these things and addressing any previous problems you had, I don't see anything wrong with this.
Bhagavad Gita - “Man is made by his belief. As he believes, so he becomes.”
William Shakespeare - “This above all: to thine ownself be true, And it must follow, as the night the day, Thou canst not then be false to any man.”